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Chinese (Traditional) translation of “that'll be the day”

that'll be the day

something you say in order to show you think something is unlikely to happen
(表示不太相信)胡說,哪有這樣的事
"Mike says he's going to give up smoking." "That'll be the day!"
「麥克說他要戒煙了。」「別聽他亂說!」
Impossible and improbable
(Definition of that'll be the day from the Cambridge English-Chinese (Traditional) Dictionary © Cambridge University Press)
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