that’s that

(idiom) there is nothing else to say about something

Example Sentences:

Kids: We want to go to Disneyland!
Parents: No, we’re going to Paris.
Kids: But we want to go to Disneyland!
Parents: We’re going to Paris, and that’s that!
Kids: You are so unfair!

I’m sorry sir, but you cannot buy a Nintendo Wii because they are sold out, and that’s that!

Media:

Similar idioms:

1. put one’s foot down
2. lay down the law
3. call off
4. fool around