that's that (1)INFORMAL
This page is about the conversational phrase that's that (1)
You can say this if a decision or arrangement is final and it won't be changed.
- "At least listen to what I have to say."
"Why? I've made up my mind, and that's that. You're wasting your breath."
- "Is it possible to change the contract?"
"It's been signed already, so that's that. It can't be changed now."
My wife said, "I'm not going, and that's that!" She
Contributor: Matt Errey