Looking up...
when pigs fly
/wɛn pɪɡz flaɪ/◆idiom
never
A: Do you think I'll finish this report by tomorrow? B: Yes, when pigs fly!
Person B is sarcastically saying it will never happen.
informal
A humorous or sarcastic way to say something will never happen.
Will I ever win the lottery? When pigs fly!
The speaker is joking that winning the lottery is impossible.
Mom: Clean your room! You: Yeah, when pigs fly.
The speaker is dismissing the request as absurd.
Often used to express skepticism or to mock an unrealistic suggestion.
Related Phrases
Pro Tip
Context Matters
Use 'when pigs fly' only in casual or humorous contexts. In professional settings, opt for phrases like 'unlikely' or 'not feasible.'
Gold Rule
Sarcasm Indicator
This idiom is almost always used sarcastically. If you mean 'never' literally, consider a more straightforward phrase like 'never' or 'at no time.'
Word Origin
The phrase dates back to at least the 16th century in English. It likely originated as a humorous exaggeration, playing on the absurdity of pigs flying as an impossible event. Similar expressions exist in other languages, such as the German 'Wenn Schweine fliegen' and the Swedish 'när korna flyger.'
Usage Notes
This idiom is used in informal speech and writing. It is often employed to dismiss an idea or request in a lighthearted or sarcastic way. Avoid using it in formal contexts.
English Dictionary