when pigs fly

idiom

Definition of when pigs fly

US, informal
used to say that one thinks that something will never happen The 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 13 Jun. 2021.

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