that's that

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that's that

  1. (idiomatic) There is nothing more to say or to do concerning the matter.
    It is quite simple. You're grounded for a week and that's that!
    • 1872, Samuel Butler, chapter 6, in Erewhon:
      They gave a little frightened cry and ran off as hard as they could. "So that's that," said I to myself, as I watched them scampering. I knew that I had better stay where I was.
    • 1908, F. Marion Crawford, chapter 17, in The Primadonna:
      The jury is satisfied and the verdict is that you needn't fuss. So that's that, and let's talk about something else.