knock oneself out

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knock oneself out (third-person singular simple present knocks oneself out, present participle knocking oneself out, simple past and past participle knocked oneself out)

1. (idiomatic, informal) To go ahead; to do as one pleases.

   "These cookies are my favorite! Can I have some?" "Sure, knock yourself out." (i.e., have as many as you want)

   (sarcastically, indicating lack of interest) "I'm going to the store." / "Knock yourself out."

• don't knock yourself out
• help oneself
• knock one out
• knock out
• suit yourself