when hell freezes over
idiom
informal + impolite
—used to say that one thinks that something will never happen
I'll apologize when hell freezes over.
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“When hell freezes over.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/when%20hell%20freezes%20over. Accessed 24 Dec. 2024.
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