Meaning of “that's done it!” in the English Dictionary

british dictionary

"that's done it!" in British English

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that's done it!

UK informal US that did it!

said when someone or something has caused damage or a difficulty:

"That's done it!" said Anna as she looked at the damage. "Now I really will have to get a new car."

(Definition of “that's done it!” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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