Used to express shock, disdain, or anger that someone could do something so presumptuous, brazen, or rude. Can be said as a question or an exclamation. How dare you speak to your mother that way? Apologize right now! How dare they accuse our company of tax fraud, after the amount of jobs and revenue we've brought into the economy!

What you have done is unacceptable. The phrase is sometimes followed by the action in question. How dare you speak to your mother that way? Apologize right now. You think you can brazenly cheat and get away with it? How dare you?