That’s that

Definition 1 of 2

Pro Tip 1/3

Resolute Closure

Used when a person is set in their decision, expressing firm finality with no room for debate. Slide

He announced his retirement, and that's that.

Pro Tip 2/3

Conversation Ender

Marks the end of a discussion, typically because a decision has been reached. Slide

We're not buying the car, and that's that.

Pro Tip 3/3

No Alternatives

Implies no other options are available or will be considered. Slide

This is our final offer, and that's that.