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that's it

Definition

B1 used to say that something has ended: Well, that's it, we've finished - we can go home now. That's it! I'm not putting up with any more of her rudeness.Expressions telling people to stop doing something B2 used to say that something is correct: You switch the computer on at the back. That's it.Words and phrases expressing agreement and acceptance
(Definition of that's it from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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