student asking question

Is "knock oneself out" an idiom? What does it mean?

teacher

Native speaker’s answer

Rebecca

You are correct "knock yourself out" is indeed an idiom. In this context, the phrase "knock oneself out" means to enjoy yourself, have a good time, do something as much as you like. It is often used sarcastically, which is the case here as obviously Sheldon would not enjoy having to move the desk by himself. Ex: You want to try and good a 5-course meal from scratch!? Okay, knock yourself out. Ex: A: I'm planning on going for a hike. B: That sounds horrible, but knock yourself out.

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