when pigs fly
Meaning
Used to say something will never happen or is extremely unlikely; often expresses disbelief or sarcasm.
Origin
Recorded since the 1600s, based on the absurd image of pigs flying; similar “impossible” sayings existed earlier in European folklore and literature.
Notes
Conveys strong disbelief and often sarcasm. Can sound dismissive or rude, so use carefully in formal or sensitive situations; common in casual speech.
Examples
-
He says he’ll pay me back tomorrow—yeah, when pigs fly.
-
She’ll apologize first when pigs fly, so don’t hold your breath.
-
They’ll finish the project on time when pigs fly.
-
I’ll believe that rumor when pigs fly.
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My brother will clean his room without being asked when pigs fly.
Grammar & Usage Notes
Fixed clause introduced by “when.” Often used alone as a sarcastic reply (“When pigs fly.”). Also appears after a statement: “He’ll apologize when pigs fly.” Tense usually future/conditional.
Synonyms
- never
- not in a million years
- no chance
- not likely
- when hell freezes over
Antonyms
- any day now
- sooner or later
- it's only a matter of time