B2idiominformalnature
when pigs fly
USUK
never, because it is impossible
Humorous and a little sarcastic, so use it with friends. Vietnamese has a similar joke: 'khi nào lợn biết bay'.
In context
He says he will tidy his room when pigs fly.
Me, run a marathon next month? Only when pigs fly!
More idioms about nature
- a big fish in a small pondan important person, but only in a small group or place
- a bird's-eye viewa view of something from high above
- a breath of fresh airsomeone or something new and different that makes a situation more pleasant
- a dark horsea person with hidden talents, or a competitor nobody expected to do well
- a drop in the oceana very small amount compared with what is needed