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when hell freezes over
01
used to express disbelief in something happening
Idiom
Informal
What is the origin of the idiom "when hell freezes over" and when to use it?
The phrase "when hell freezes over" is an idiom used to convey the idea that something is so unlikely or impossible that it will never occur. The expression likely stems from the perception that hell, being a place of extreme heat and torment, could only freeze over in the most unimaginable and improbable circumstances.
Examples
He'll admit he was wrong when hell freezes over.
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