when pigs fly

idiom

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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Cite this Entry

“When pigs fly.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/when%20pigs%20fly. Accessed 23 Nov. 2024.

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