that'll be the day

English

Pronunciation

Audio (AU) (file)

Phrase

that'll be the day

(idiomatic) Said in reply to something that one believes will never happen.
Synonym: that'll be the frosty Friday

I’m going to get into work on time today. — That’ll be the day!

Translations

said in reply to something that one believes will never happen

French: quand les poules auront des dents (fr)
Russian: когда́ рак на горе свистнет (ru) (kogdá rak na gore svistnet)
Spanish: el día que la vaca vuele

See also

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