that will 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.
that will be the day
something is very unlikely to happen. informal 1991 Alistair Campbell Sidewinder ‘Now for my proposal, which you'll find irresistible.’ ‘That'll be the day.’
See also: that, will
Farlex Partner Idioms Dictionary
- on one's
- on someone's
- #dead
- (Have you) been OK?
- other than
- other than (something)
- pillow-biter
- out of one's
- let something drop
- (I've) got to go