Definition of “pigs might fly” - English Dictionary

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“pigs might fly” in British English

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pigs might fly

UK humorous saying US pigs can fly

said when you think that there is no chance at all of something happening:

"I'll have finished it by tomorrow." "And pigs might fly!"

(Definition of “pigs might fly” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)