Meaning of the word "when hell freezes over" in English

What does "when hell freezes over" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

when hell freezes over

US /wɛn hɛl ˈfriːzɪz ˈoʊvər/
UK /wɛn hɛl ˈfriːzɪz ˈoʊvər/
"when hell freezes over" picture

Idiom

1.

never; not ever

Example:
I'll apologize to him when hell freezes over.
She'll agree to that plan when hell freezes over.
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