Significado de “that'll be the day” - Diccionario inglés

british diccionario

that'll be the day en inglés británico

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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!"

(Definición de that'll be the day de Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)