We use this expression to warn someone not to do something. Often it’s not a very serious situation.
You can use this phrase in ………… language.
A: There’s only one piece of cake left. Can I have it?
B: Don’t you dare! I’m saving that for Hanka. She hasn’t had any.
A: Pavla! We’re going to play Monopoly – come here!
B: Don’t you dare! I haven’t got time to play games.