Akademik

that is it
that is it (or 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 to visit the museum and that's it. [=that is all I wanted to do here]

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 you will not accept any more of something

That's it! I'm leaving!

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Main Entry:it

Useful english dictionary. 2012.