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English definition of “that's (about) it”

that's (about) it

(also that's that)
infmlthere is no more to be said or done: OK everybody, I think that's it. You can all go home. We talked about the election – that was about it. I won’t agree to it and that’s that.
(Definition of that's (about) it from the Cambridge Academic Content Dictionary © Cambridge University Press)

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