inside
gb/ˈɪnsˌaɪd/ us/ˈɪnsˌaɪd/
A1
English
~ 2000
Senses
0 senses
preposition
A1
relation
1
Within the interior of something
Shows that something or someone is in the inner part of a place or thing.
Usage pattern:
[someone/something] inside [something]
Common mistake:
Learners sometimes confuse 'inside' with 'into'. 'Inside' describes location, while 'into' describes movement toward the inside.
Synonyms
within (Slightly more formal and less common in everyday speech.)
Antonyms
outside (Indicates being beyond or not within the boundaries of something.)
Collocations
inside the house
|inside the box
|inside the building
|inside the room
Themes
daily life
|spatial relations
|space
|core_vocabulary
Examples
- She waited inside the car until the rain stopped.
- There’s a surprise waiting for you inside the box.
- The cat is hiding inside the cupboard.
Learner examples
- The dog is inside the house.
- I put my phone inside my bag.
- They are sitting inside the room.
Noun
A2
entity
2
The inner part of something
The inner part of something, not the outside.
Usage pattern:
the inside of [something]
Synonyms
interior (More formal and often used for buildings, vehicles, or design contexts.)
Antonyms
outside (Refers to the external part or surface.)
Collocations
inside of the bag
|inside of the building
|inside of the mouth
Themes
daily life
|spatial relations
|space
|body
|core_vocabulary
Examples
- The inside of the envelope was lined with gold paper.
- He cleaned the inside of the fridge thoroughly.
- The inside of the car was warm and comfortable.
Learner examples
- The inside of my shoe is wet.
- I painted the inside of my room blue.
- He looked at the inside of the box.
adverb
A1
relation
3
In an interior space
In or into the inner part of something.
Usage pattern:
go/come/stay inside
Synonyms
indoors ('Indoors' usually refers specifically to being within a building.)
Antonyms
outside (Refers to being in open air or beyond boundaries.)
Collocations
come inside
|stay inside
|go inside
Themes
daily life
|spatial relations
|space
|core_vocabulary
Examples
- It’s cold out here; let’s go inside.
- She went inside to get a drink.
- They stayed inside during the storm.
Learner examples
- Come inside, it is warm here.
- I went inside because it was raining.
- He is inside now.
adjective
A2
property
4
Located on inner side or surface
On or about the inner side of something.
Synonyms
inner ('Inner' is broader and can refer to abstract concepts like 'inner thoughts'.)
Antonyms
outside (Referring to being on the outer side or surface.)
Collocations
inside edge
|inside pocket
Themes
daily life
|space
|core_vocabulary
Examples
- The coat has an inside pocket for valuables.
- He wrote his name on the inside cover of the book.
- The label is on the inside seam.
Learner examples
- The bag has an inside pocket.
- My name is on the inside cover.
- The tag is on the inside seam.
Noun
informal
B2
entity
5
Confidential internal information
Special secret information from within a group or company.
Synonyms
exclusive information (Emphasizes uniqueness rather than secrecy alone.)
Antonyms
public information (Information available to everyone.)
Collocations
inside information
|inside knowledge
Themes
business
|media
|communication
|core_vocabulary
Examples
- Reporters are trying to get some inside information about the deal.
- She had inside knowledge that helped her make a profit.
- He gave me an inside tip on which horse would win.
Learner examples
- He has inside information about the company.
- She gave me an inside tip about the game.
- They want inside knowledge of the plan.
Grammar
Dictionary form
inside
IPA
GB/ˈɪnsˌaɪd/
US/ˈɪnsˌaɪd/
Syllables & stress
in - side (2 syllables)
Stress on 1st syllable (in)
Word forms
Adjective
- Base: inside
Noun
- Base: inside
- Plural: insides
Word family
Expressions
get under someone's skin (on the inside)
1/ɡˈɛt ˈʌndɚ sˈʌmwˌʌnz skˈɪn ˈɔn ðə ˈɪnsˌaɪd/
idiom
informal
Affect someone emotionally from within
To make someone feel strong emotions, often annoyance, from deep inside.
Examples
- His criticism really got under my skin on the inside.
- Sometimes her words get under my skin and stay there.
inside out
1/ˈɪnsˌaɪd ˈaʊt/
fixed phrase
With inner surface outward; completely familiar with something
With the inner side turned outward; knowing something very well.
Examples
- You’re wearing your sweater inside out.
- She knows that book inside out.
on the inside
1/ˈɔn ðə ˈɪnsˌaɪd/
fixed phrase
From within a place or group
Being in a place or group, not outside it.
Examples
- She knows how things work on the inside.
- From the outside he seems friendly, but on the inside he’s very private.