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

british dictionary

"that's it" in British English

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that's it

B1 used to say that something has ended:

Well, that's it, we're done - we can go home now.
That's it! I'm not listening to any more of your lies.

B2 used to say that something is correct:

You switch the computer on at the back. That's it.

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