dare:[intransitive not in progressive] to be brave enough to do something that is risky or that you are afraid to do - used especially in questions or negative sentences
dare (to) do something
toは省略可。
例文を2つ。
I daren't go home. Only a few journalists dared to cover the story.
How dare you talk to me with such disrespect? よくも私にそんな失礼な口がきけるな
Don't you dare speak to me like that! 私にそんな口をきいたら承知しないぞ。(強い警告)