that's it

phrase

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.!