boom
gb/bˈum/ us/bˈum/
A2
English
~ 7400
Senses
0 senses
Noun
B1
event
1
period of rapid economic growth
A time when business or an activity grows very fast and does very well.
Usage pattern:
a boom in [something]
Common mistake:
Learners sometimes confuse “boom” with “bump” or “bomb.” “Boom” in this sense is positive growth, not something negative. Also, learners may say *“a boom of tourism”*; the more natural phrase is *“a boom in tourism.”*
Synonyms
upswing (More general word for improvement, not always as strong or fast as a boom.)
Antonyms
recession (Refers to a period of economic decline, the opposite of a boom in economic contexts.)
Collocations
economic boom
|housing boom
|baby boom
|boom in demand
|boom period
|boom years
Themes
economy
|business
|society
|finance
Examples
- The country enjoyed a technology boom in the early 2000s.
- After the war, there was a boom in car ownership.
- Tourism is experiencing a real boom in this region.
- The housing boom pushed prices to record highs.
- Many new restaurants opened during the city’s economic boom.
Learner examples
- The city is in a boom because many new jobs are coming.
- There was a big boom in online shopping last year.
- After the new train line opened, there was a boom in visitors.
- The company grew fast during the tech boom.
- People made a lot of money in the boom.
Noun
A2
event
2
sudden loud deep sound
A sudden very loud and deep noise, like from a big hit or explosion.
Usage pattern:
a boom from [something]
Common mistake:
Learners sometimes use only “explosion” as a noun and forget they can use “boom” to describe the sound itself. Also, they may write *“hear a explode”* instead of *“hear a boom”* or *“hear an explosion.”*
Synonyms
bang (Common everyday word; often higher-pitched or sharper, while “boom” suggests deeper, heavier sound.)
Antonyms
silence (The absence of sound, which contrasts with a loud boom.)
Collocations
a loud boom
|a sudden boom
|with a boom
|the boom of thunder
|the boom of a gun
|a distant boom
Themes
sound
|daily_life
|nature
|weather
Examples
- There was a loud boom and the windows shook.
- We heard the boom of thunder in the distance.
- A dull boom came from the direction of the old factory.
- The fireworks went off with a sharp boom.
- The boom of the drum echoed through the hall.
Learner examples
- We heard a big boom outside the house.
- The door hit the wall with a boom.
- After the flash of light, there was a boom.
- I woke up when I heard a boom in the night.
- Suddenly, a boom came from the street.
Verb
B1
action
3
to grow or prosper quickly
To become very busy, big, or successful in a short time.
Usage pattern:
[something] is booming
Common mistake:
Learners sometimes say *“boom up”* or *“boom quickly”*; the usual pattern is simply *“is booming”* without an extra adverb or particle. They may also incorrectly use it for people (*“He is booming”*) instead of their business or career.
Synonyms
flourish (Slightly more formal; suggests healthy growth, not always as fast or dramatic as “boom.”)
Antonyms
decline (Describes a process of going down in success or size, the opposite of booming growth.)
Collocations
business is booming
|tourism is booming
|the industry is booming
|booming economy
|booming market
|booming sector
Themes
economy
|business
|society
|core_vocabulary
Examples
- Online food delivery services are booming in major cities.
- The local tech scene is booming thanks to new investment.
- Her small shop is booming after going viral on social media.
- The construction industry is booming again this year.
- Tourism is booming as travel restrictions are lifted.
Learner examples
- His business is booming right now.
- Online sales are booming this month.
- The city is booming because many people move there.
- The coffee shop started to boom after the good reviews.
- The game company boomed after it released a hit game.
interjection
informal
B2
entity
4
exclamation for sudden impact
A short sound word you say to show something big, sudden, or impressive just happened.
Common mistake:
Learners may overuse “boom” in formal writing, where it sounds too casual. It should be kept for speech, texting, or informal writing.
Synonyms
bam (Very similar informal exclamation; often sounds slightly more playful or comic.)
Antonyms
oops (Exclamation for a mistake, contrasting with “boom” used for success or big impact.)
Collocations
and boom, [result]
|then boom, [something happened]
|boom, done
|boom, there it is
Themes
conversation
|emotion
|slang
|communication
|core_vocabulary
Examples
- I hit “send” and boom, the email went to the whole company.
- One wrong word and boom, the argument started again.
- You add the final piece and boom, the puzzle is finished.
- She clicked the button and boom, the screen went black.
- I refreshed the page and boom, the tickets were sold out.
Learner examples
- I pressed the key and boom, the game started.
- He said one bad thing and boom, she was angry.
- We opened the door and boom, loud music hit us.
- I tried the code and boom, it worked.
- We turned the corner and boom, there was the sea.
Noun
technical
C1
entity
5
horizontal pole on a sailboat
A long bar at the bottom of a boat’s sail that helps control the sail.
Usage pattern:
the boom of [a sailboat]
Common mistake:
Learners may confuse this “boom” with the loud sound. In sailing contexts, “boom” refers to the pole, not a noise.
Synonyms
sail spar (More general technical term for any pole supporting a sail; less specific than “boom.”)
Antonyms
mast (Another main pole on a sailboat but vertical, contrasting with the horizontal boom.)
Collocations
the boom swings
|hit by the boom
|boom of the mainsail
|duck under the boom
|attach the boom
|boom vang
Themes
transport
|sports
|technology
|travel
|transportation
Examples
- She ducked quickly as the boom swung across the deck.
- The wind caught the sail and slammed the boom to one side.
- He tightened the line that holds the boom in place.
- A loose boom can be very dangerous for people on board.
- They lowered the boom before coming into the harbor.
Learner examples
- Be careful, the boom can hit your head.
- The wind moved the sail and the boom swung.
- He fixed the boom at the bottom of the sail.
- We pulled a rope to move the boom.
- They took down the sail and then the boom.
Noun
technical
B2
entity
6
support arm for mic or camera
A long bar that holds a microphone or camera in the right place.
Usage pattern:
a boom for [equipment]
Common mistake:
Learners sometimes think “boom mic” is two separate ideas; it is a fixed term for a microphone on a boom, not a mic that makes a booming sound.
Synonyms
boom arm (A more specific compound term; used especially for stands and mounts.)
Antonyms
handheld (Describes equipment held directly in the hand instead of mounted on a boom.)
Collocations
boom microphone
|camera boom
|on the boom
|hold the boom
|boom operator
|boom arm
Themes
media
|technology
|work
|arts_entertainment
Examples
- The boom microphone dipped into the top of the shot.
- He adjusted the boom so the mic was just out of frame.
- The boom operator stood quietly above the actors.
- They used a camera boom to get a smooth overhead shot.
- She mounted the light on a boom arm over the desk.
Learner examples
- The sound man holds the mic on a boom.
- They use a boom so the camera can move smoothly.
- The microphone hangs from a long boom.
- He moved the boom closer to the singer.
- A boom lets the mic stay near the actor’s mouth.
Noun
B2
entity
7
barrier bar at crossings or gates
A long pole that goes up and down to stop cars from passing.
Usage pattern:
a boom at [a gate/crossing]
Common mistake:
This sense is more common in some varieties of English (e.g., Australian English) than others; learners may not recognize it and think only of the sound meaning.
Synonyms
barrier (General word for something that blocks movement; “boom” refers to the long horizontal bar type of barrier.)
Antonyms
open passage (Refers to movement without a barrier, opposite of a boom blocking the way.)
Collocations
railway boom
|level crossing boom
|boom gate
|raise the boom
|lower the boom
|security boom
Themes
transport
|infrastructure
|safety
|transportation
|travel
Examples
- We waited while the boom at the level crossing lifted.
- The parking lot boom stayed down until we paid.
- A security guard stood next to the boom gate.
- The train passed and the boom slowly rose.
- Cars lined up in front of the lowered boom.
Learner examples
- The boom at the train crossing went down.
- A car cannot pass until the boom goes up.
- The guard opened the boom for the truck.
- They fixed the broken boom at the parking lot.
- We stopped when we saw the boom in front of us.
Verb
B2
action
8
to make a loud deep sound
To make a very loud and deep noise.
Usage pattern:
[something] booms
Common mistake:
Learners may try to use “boom” for any loud sound, even high and sharp ones; it is best for deep, heavy sounds rather than, for example, a small glass breaking.
Synonyms
rumble (Suggests a rolling, often softer or longer sound; “boom” is usually louder and more explosive.)
Antonyms
fade (Describes sound becoming weaker or disappearing, in contrast to loud booming.)
Collocations
guns boomed
|music boomed
|thunder boomed
|voice boomed
|boom out
|booming loudly
Themes
sound
|nature
|war
|core_vocabulary
Examples
- Thunder boomed overhead as the storm moved in.
- Cannons boomed in the distance all night.
- His voice boomed across the hall without a microphone.
- Music boomed from the speakers at the festival.
- The waves boomed against the rocky cliffs.
Learner examples
- The big drum boomed in the room.
- Loud music boomed from the car.
- Thunder boomed and the lights went out.
- His deep voice boomed in the small office.
- Guns boomed during the military show.
Verb
C1
action
9
to promote loudly or heavily
To talk about something a lot and very positively so that more people will like or buy it.
Usage pattern:
to boom [a product/event/person]
Common mistake:
This use is less common in modern everyday speech; learners might overuse it instead of more natural verbs like “promote,” “advertise,” or “hype.”
Synonyms
hype (Informal; suggests strong, sometimes exaggerated promotion similar to “boom.”)
Antonyms
ignore (To pay no attention and give no promotion, the opposite of booming something.)
Collocations
boom a product
|boomed as the next big thing
|boomed in the press
|heavily boomed
|boomed by advertisers
|boomed by the media
Themes
business
|media
|politics
|communication
Examples
- The studio boomed the film as the must-see hit of the summer.
- The company boomed its new phone on social media.
- Local politicians boomed the project as a cure for unemployment.
- The event was heavily boomed on radio and television.
- Critics said the product was boomed far more than it deserved.
Learner examples
- They boomed the new game on TV.
- The company boomed its product with big ads.
- The city boomed the festival to bring more tourists.
- The book was boomed as the best of the year.
- His manager boomed him as a future star.
Noun
technical
C1
entity
10
floating barrier on water
A long line of floating blocks or tubes on water that keeps oil, wood, or trash in one place.
Usage pattern:
a boom around [oil/logs/debris]
Common mistake:
Learners may think “oil boom” only means a time of economic growth from oil; in environmental news, “oil boom” can also mean a floating barrier used to catch spilled oil.
Synonyms
containment barrier (A more descriptive technical phrase; less specific about being floating on water.)
Antonyms
open water (Water with no barrier to block movement of oil or debris.)
Collocations
oil boom
|floating boom
|containment boom
|deploy a boom
|set up a boom
|log boom
Themes
environment
|industry
|transport
|nature
|science
Examples
- Workers deployed an oil boom to limit the spill.
- A floating boom surrounded the ship to catch any leaking fuel.
- The log boom kept the timber from drifting downriver.
- Crews installed a containment boom near the shore.
- The boom redirected debris away from the intake pipes.
Learner examples
- They put an oil boom on the water after the accident.
- A boom stopped the trash from going into the lake.
- The logs stayed together behind the boom.
- Workers set a boom around the broken ship.
- The boom helped protect the beach from the oil.
Grammar
Dictionary form
boom
IPA
GB/bˈum/
US/bˈum/
Syllables & stress
boom (1 syllable)
Stress on 1st syllable (boom)
Word forms
Noun
- Base: boom
- Plural: booms
Verb
- Base: boom
- 3rd Person Singular: booms
- Present Participle: booming
- Past: boomed
Word family
Forms
booms
noun
booming
verb
boomed
verb
Related words
boomer
noun B2
Advanced or less common
boomy
adjective
boomtown
noun
Expressions
baby boom
1/bˈeɪbi bˈum/
fixed phrase
period of unusually high births
A time when an unusually large number of babies are born.
Examples
- After the war there was a baby boom.
- The school was built to serve the children of the baby boom.
- Some countries are now seeing a new baby boom.
boom box
1/bˈum bˈɑks/
fixed phrase
informal
portable stereo with loud speakers
A portable music player with speakers that you can carry and play loudly, often using batteries.
Examples
- He carried a boom box on his shoulder in the park.
- They played music from a small boom box at the beach.
- Her old boom box still works after all these years.
boom town
1/bˈum tˈaʊn/
fixed phrase
town growing very quickly
A town that becomes big and busy very quickly because of new jobs or money.
Examples
- The small fishing village became a boom town after oil was found nearby.
- During the gold rush, many boom towns appeared in the region.
- The city is now a boom town thanks to the tech industry.
business is booming
1/bˈɪznɪs ˈɪz bˈumɪŋ/
fixed phrase
business is doing extremely well
Used to say that a business has many customers and is making a lot of money right now.
Examples
- Our online store is open 24/7 and business is booming.
- Thanks to the holiday season, business is booming.
- With all the tourists in town, business is booming for local restaurants.
economic boom
1/ˌɛkənˈɑmɪk bˈum/
fixed phrase
time of strong economic growth
A time when a country’s economy grows very fast and many people and companies earn more money.
Examples
- The region experienced an economic boom after oil was discovered.
- The economic boom led to a rise in living standards.
- Many new jobs were created during the economic boom.
housing boom
1/hˈaʊzɪŋ bˈum/
fixed phrase
rapid growth in housing market
A time when many homes are sold or built and house prices go up quickly.
Examples
- The city is in the middle of a housing boom.
- During the housing boom, prices doubled in five years.
- The housing boom attracted many investors.
lower the boom (on someone)
1/lˈoʊɚ ðə bˈum ˈɔn sˈʌmwˌʌn/
idiom
informal
suddenly punish or act hard
To suddenly punish someone or act very strictly with them after a rule is broken.
Examples
- The coach finally lowered the boom on players who were always late.
- If you cheat again, the boss is going to lower the boom on you.
- Parents sometimes have to lower the boom when children keep breaking the rules.
boom and bust
1/bˈum ˈænd bˈʌst/
idiom
cycle of growth then decline
A repeated cycle where the economy grows very fast and then goes down again.
Examples
- The country has gone through several boom and bust cycles.
- The oil industry has always been a story of boom and bust.
- This industry is known for its boom and bust pattern.
- Politicians say they want to end the boom‑and‑bust cycle in housing.
- Better regulation could reduce the effects of boom and bust on small businesses.
- Farmers in the region are used to boom and bust years.
boom or bust
1/bˈum ˈɔɹ bˈʌst/
idiom
informal
either great success or failure
Used when something will either succeed in a very big way or fail completely, with little middle ground.
Examples
- For many start-ups, it’s boom or bust in the first few years.
- The project is a boom or bust gamble for the company.
- In that risky market, it’s often boom or bust.
boom or bust
2/bˈum ˈɔɹ bˈʌst/
idiom
Either great success or total failure
a situation where something will either do very, very well or fail very badly, with nothing in between
Examples
- For many startups it’s boom or bust within the first few years.
- Investing all your savings in one stock is a boom‑or‑bust strategy.
- It was boom or bust for the small mining town.
sonic boom
1/sˈɑnɪk bˈum/
fixed phrase
loud sound from supersonic travel
A very loud, explosive sound made when something, like a fast jet, travels through the air faster than the speed of sound.
Examples
- People heard a sonic boom as the fighter jet passed overhead.
- The windows rattled when the sonic boom hit the town.
- Residents reported a mysterious sonic boom late last night.
sonic boom
2/sˈɑnɪk bˈum/
fixed phrase
technical
loud sound from breaking sound barrier
A very loud sound that happens when something, like a fast jet, moves faster than sound.
Examples
- People reported hearing a sonic boom as the jet passed overhead.
- The windows rattled when the sonic boom hit the city.
- Sonic booms can cause minor damage to buildings.