dare (to) do sth › to be brave enough to do something: I didn't dare tell Dad that I'd scratched his car.
dare sb to do sth › to try to make someone do something dangerous: She dared her friend to climb onto the roof.
Don't you dare informal › used to tell someone angrily not to do something: Don't you dare hit your sister!
How dare she/you, etc › used to express anger about something someone has done: How dare you talk to me like that!
I dare say (also I daresay) › used when you think that something is probably true or will probably happen: I dare say she'll change her mind.