What is Dare ?
Dare is (verb) 1. to be brave enough to do something I bet you wouldn’t dare put your hand into the cage and stroke that tiger. I dare say very probably I dare say you’re right. to dare not do something to not be brave enough to do something I daren’t go out or I don’t dare go out or I dare not go out into the street while that man is standing there. 2. to challenge someone to do something by suggesting it is cowardly not to do it I dared him to go the meeting in his pink tracksuit. 3. used for telling someone how angry you are Don’t you dare do that again! How dare you look in my desk drawers! (noun) the act of challenging someone to do something He only climbed on the roof for a dare.
source: Easier English, Student Dictionary Upper Intermediate Level