Idioms

That'll be the day!

that'll be the day

Said of something that is unlikely to happen. A politician speaking the truth? Ha, that'll be the day!
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.

That'll be the day!

Inf. It will be an unusually amazing day when that happens! Bill: I think I'll fix that lamp now. Andy: When you finally get around to fixing that lamp, that'll be the day! Sue: I'm going to get this place organized once and for all! Alice: That'll be the day!
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

That’ll be the day!

exclam. That will never happen! When he gets his own car—that’ll be the day!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
See also:
References in periodicals archive
That'll be the Day! 1950s Newcastle, through Tyne Bridge Publishing, is on sale now.
That'll be the Day! 1950s |Newcastle, through Tyne Bridge Publishing, is on sale now, priced PS13.
The 1950s, the decade when we were told we'd never had it so good..
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