when hell freezes over
informalIf you say that something will happen when hell freezes over, you mean that it will never happen.
Thesaurus: synonyms and related words
Always & never
- again
- all along idiom
- all-time
- along
- always
- ever
- first
- hell
- in all my (born) days idiom
- in/through all the years idiom
- invariably
- month
- perpetual
- perpetually
- till/until kingdom come idiom
- till/until the cows come home idiom
- time
- will
- world
- year
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