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till hell freezes over

Forever, as in They said they'd go on searching till hell freezes over, but I'm sure they'll give up soon. This hyperbolic expression dates from the early 1900s. So does its antonym, not till hell freezes over, meaning “never,” as in I'm not giving in, not until hell freezes over.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.