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(and) that's that
That is final; the issue is settled or completed. You are going to your sister's recital and that's that! No more complaining. That's that! I just send the proofs to the printer. Let's just say that's that and be done with it.
Also, that takes care of that. There's no more to be said or done; the matter is finished, the issue is settled. For example, Dad's not buying you a television set, and that's that, or We've paid all we owe, and that takes care of that. [Early 1800s]
1. People say that's that to say that something is finished or has been dealt with. Once all my hair had gone I could just say `Well, it's happened and that's that.' `Well that's that, then,' he said with relief. `Now I can go.'
2. People say that's that to show that they will not accept any arguments. We're going out and that's that.
that's thatthere is nothing more to do or say about the matter.
(and/so) ˌthat’s ˈthatused to show that something is finished or decided, and there should be no more discussion or argument: So that’s that. At last we’re all agreed. ♢ You’re going to bed now, and that’s that! I don’t want any argument!
That’s all; that finishes it. This expression may have begun life as that’s for that; James Kelly’s Scottish Proverbs (1721) stated, “That’s for that. . . . Spoken when a thing fits nicely what it was design’d for.” The present-day locution dates from the early twentieth century, and there are several variants: and that is that; and that’s that; well, that’s that. All of them became current in the middle of the century. See also that does it.