Dare.

なかなか使い慣れないdare。

Drink　or　Dare　もイマイチまだ意味が分からない。


He took my dare to jump from the tree.
飛び降りてみろ、と言ったら本当に飛び降りた。

He is thinking and thinking whether he dare.
あえてそうすべきか

How dare you talk in that way? Where's your respect for your father?
よく平気で

I dare not tell your parents yet
あえてやってない（過去形にもなっている）

I daren't [dare not] think how much money I spend on my family's good health.
あえてしない

She dared not speak to him there. She dared hardly look.
あえてしなかった（過去形）

Slap me, if you dare!
やれるものならやってみろ

If he dared, he would kill me now
もしそんな勇気があるなら

"I dare say, I dare say," she replied.
きっとそうだと思う　（全然違う意味だね、また。I　guessみたいな感じ？）

The politician dared a new interpretation of the Constitution
大胆にも試みた

I hardly dared (to) hope for it
それを望む勇気はない

He ran without daring to look back.
あえて振り向くこともせず

Don't you dare!
わざわざやるな　＝　やめろ！