Translation of "that'll be the day" - English-Mandarin Chinese dictionary

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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!" “迈克说他要戒烟了。”“别听他胡扯!”

(Translation of “that'll be the day” from the Cambridge English-Chinese (Simplified) Dictionary © Cambridge University Press)

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