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

American

"that's (about) it" in American English

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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)