when pigs fly

idiom

Definition of when pigs fly

US, informal
used to say that one thinks that something will never happenThe train station will be renovated when pigs fly.

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“When pigs fly.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/when%20pigs%20fly. Accessed 4 Aug. 2020.

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