that'll be the day

idiom

Definition of that'll be the day

used to say that one thinks something will not happen "Do you think he'll ever admit he made a mistake?" "That'll be the day!"

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that

that'll be the day

that'n

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Cite this Entry

“That'll be the day.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/that%27ll%20be%20the%20day. Accessed 20 Sep. 2021.

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