Why does an alarm clock "go off" when it starts to beep?!

Question: Shouldn't it be "go on"?

Answers: Shouldn't it be "go on"?

No no, It's you that goes off when the alarm beeps.

Congratulations you've found an oxymoron

I don't know. Why do gynaecologists ask women to undress behind a screen if they're going to look anyway?

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