once
One single time in the past
Used to say something happened only one time before now.
[someone/something] once [verb]
- I once met a famous actor at the airport.
- She once lived in Paris before moving to London.
- He once told me he wanted to be a pilot.
- They once owned a small cafe in the city.
- We once went camping in the mountains.
- I once saw a lion at the zoo.
- She once worked in a big office.
- He once played football for his school.
- We once ate dinner at that restaurant.
- They once visited my house.
At some point before now
Used to talk about any time before now, especially in negative sentences.
if/when [someone/something] once [verb]
- Not once did he complain about the long hours.
- If she once trusts you, she will tell you everything.
- Never once have I regretted my decision.
- I have not once been to Japan.
- He never once called me.
- She has not once eaten sushi.
As soon as something happens
Used to say something will happen right after another thing happens.
once [clause], [clause]
- Once you finish your homework, you can watch TV.
- I knew I had made a mistake once I saw her face.
- Once the sun sets, it gets cold quickly.
- Once I eat, I feel happy.
- You can play once you clean your room.
- Once we get there, we will rest.
At a former time, not now
Used to say something was true before but is not true now.
[someone/something] was once [adjective/noun]
- She was once a celebrated singer, but now she lives quietly.
- This area was once full of farms, but now it's all houses.
- He was once my best friend.
- I was once very shy.
- This place was once a park.
- She was once my teacher.
once and for all
1finally and completely ending something
To do something one final time so it is finished forever.
- Let’s settle this once and for all.
- He quit smoking once and for all.
once and for all
2Finally and completely ending something
To do something so it will never need to be done again.
- Let's settle this argument once and for all.
- He fixed the problem once and for all by replacing the whole system.
once in a while
1Occasionally, not often
Sometimes, but not often.
- We go out for dinner once in a while.
- I like to read a novel once in a while.
- Once in a while, I like to take a long walk alone.
- We meet for coffee once in a while to catch up.
once upon a time
1Traditional story beginning phrase
A phrase used at the start of old stories to mean 'a long time ago'.
- Once upon a time, there was a small village by the sea.
- Once upon a time, there was a little princess who loved to sing.
- Once upon a time, a brave knight lived in a faraway land.
- Once upon a time, people traveled by horse and carriage.
once bitten, twice shy
1Cautious after bad experience
After something bad happens, you are careful not to let it happen again.
- I won't lend him money again—once bitten, twice shy.
- I don’t lend money anymore—once bitten, twice shy.
- She avoids online shopping now; once bitten, twice shy.
- She avoided dating for years; once bitten, twice shy.
once bitten, twice shy
2Cautious after bad experience
After something bad happens once, you are more careful next time.
- I won't lend him money again—once bitten, twice shy.
- She was hurt in her last relationship and is now once bitten, twice shy.