that's it

idiom

Definition of that's it

informal
1 used to say that something is finished or completed Okay, that's it. You can go now.
2 used to say that something is all that is needed or wanted I came here just to visit the museum and that's it.
3 used to say that something is correct "I can't remember his name." "I think it was Brian Johnson." "Yes, that's it."
4 used in an angry or annoyed way to say that one will not accept any more of something That's it! No more horseplay in the house.!

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a servile follower or underling

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