that'll be the day Meaning in the Cambridge English Dictionary

Meaning of “that'll be the day” in the English Dictionary

"that'll be the day" in British English

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that'll be the day

something you say in ​order to show you ​think that something is ​unlikely to ​happen: "Mike says he's going to give up ​smoking." "That'll be the day!"
(Definition of that'll be the day from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
Translations of “that'll be the day”
in Chinese (Simplified) (表示不太相信)胡扯,哪有那样的事…
in Chinese (Traditional) (表示不太相信)胡說,哪有這樣的事…
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“that'll be the day” in British English

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peaceful, quiet, and without worry

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