Definition
Said in reply to something that one believes will never happen.
Origins
Originally referring to a significant day in the future regarded as worth waiting for.
In Context
- "I’m going to get into work on time today. — That’ll be the day!"
- "Transmission from Klingon ship: Federation ship Enterprise. Surrender and prepare to be boarded. / Jean-Luc Picard (Patrick Stewart): That will be the day."
Also Said As
See Also
- a cold day in hell
- a week from next Tuesday
- until the cows come home
- when hell freezes over
- when pigs fly