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Related to dare: DRAE
don't you dare
An emphatic way to tell someone not to do something. Don't you dare say something vulgar like that to your mother! Don't you dare touch that autographed baseball—it's worth a lot of money!
See also: dare
how dare you
You have done something unacceptable. 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?
I dare say
I assume, assert, or am quite certain. (Somewhat formal or old fashioned.) I dare say we'll hear from him again before the year is done. These trips are always rather tedious, but I dare say we'll be able to find something to divert our attention.
dare someone (to do something)
to challenge someone to do something. Sally dared Jane to race her to the corner. You wouldn't do that, would you? I dare you.
You wouldn't dare (to do something)!
an exclamation that shows disbelief about something that the speaker has stated an intention of doing. Bill: I'm going to leave school. Tom: You wouldn't dare leave! Bill: Be quiet or I'll slap you. Jane: You wouldn't dare to slap me!
I dare say
1. I venture to assert or affirm, as in I dare say my point of view will be heard. [c. 1300]
2. Also, I daresay. I presume or assume to be likely, as in I daresay you'll be invited. This usage is more common in Britain than in America. [Mid-1700s]