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]
Words nearby that'll be the day
BEHIND THE PHRASE
What does that’ll be the day mean?
That’ll be the day is a phrase that means something is never going to happen or is incredibly unlikely to happen, as in That’ll be the day I apologize for standing up for my sister!
That’ll be the day is most often used when a person is being ironic, sarcastic, or skeptical. When used in that way, the phrase is often said with contempt or smugness.
That’ll be the day is used in the same way as phrases like “when pigs fly,” “fat chance,” “not in a million years” and many others that express extreme doubt or skepticism that something will actually happen.
Example: You think I am going to win the contest? That’ll be the day! I never win anything.
Where does that’ll be the day come from?
The first records of that’ll be the day come from around 1916. Originally used in Australia and New Zealand, the phrase was first used to mean “that will be a day worth waiting for.” Today the phrase is nearly always used ironically to imply that the day is never going to come.
You can use that’ll be the day when you think something is never going to happen, like all ice cream becoming free. When spoken, that’ll be the day is often accompanied with a sound or facial expression, such as a snort or smirk, that further emphasizes a person’s skepticism.
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How is that’ll be the day used in real life?
That’ll be the day is a phrase used to mean the speaker thinks that something is never going to happen.
Eventually, a boy is going to be like "wow, I'd like to spend time with you." I won't have to convice him I'm worth it. That'll be the day.
— Luke (@LukeMiltz) April 15, 2017
Imagine if the #Eagles could play an all around good game. That'll be the day…
— Inside The Iggles (@InsideIggles) November 29, 2016
The day I eat fruit for dessert… That'll be the day. But until then… 🍦🍰🎂🍮🍬🍭🍫🍩🍪😂
— Michael Rector (@michaelrector) June 16, 2016
Try using that’ll be the day!
True or False?
That’ll be the day means a person is waiting for something they think is going to happen fairly soon.
How to use that'll be the day in a sentence
France 24 is providing live, round-the-clock coverage of both scenes as they progress.
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For many years afterward it was a never-ending topic of conversation, and is more or less talked of even to this day.New York’s Most Tragic Ghost Loves Minimalist Swedish Fashion|Nina Strochlic|January 8, 2015|DAILY BEAST
“We talked about the science the whole time the other day,” Krauss told The Daily Beast in a phone interview.Sleazy Billionaire’s Double Life Featured Beach Parties With Stephen Hawking|M.L. Nestel|January 8, 2015|DAILY BEAST
Gunshots rang out in Paris this morning on a second day of deadly violence that has stunned the French capital.
The afternoon was a lovely one—the day was a perfect example of the mellowest mood of autumn.Confidence|Henry James
Edna did not reveal so much as all this to Madame Ratignolle that summer day when they sat with faces turned to the sea.The Awakening and Selected Short Stories|Kate Chopin
Each day she resolved, "To-morrow I will tell Felipe;" and when to-morrow came, she put it off again.Ramona|Helen Hunt Jackson
There are three things a wise man will not trust: the wind, the sunshine of an April day, and woman's plighted faith.Pearls of Thought|Maturin M. Ballou
The proceedings of the day commenced with divine service, performed by Unitarian and Baptist ministers.