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.
Cite this Entry
“When pigs fly.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/when%20pigs%20fly. Accessed 31 Oct. 2025.
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