that'll be the day
Idioms & Phrases
that'll be the day
That will never happen, that's very unlikely, as in You think I'll win the lottery? That'll be the day! Presumably this phrase is short for that will be the day worth waiting for, but it is nearly always used ironically, as in the example. [Mid-1900s]
The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Copyright © 1997. Published by Houghton Mifflin.
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That'll be the day
is always a great word to know.
So is callithumpian. Does it mean:
| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
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