knock oneself out

verb

To go ahead; to do as one pleases; to enjoy oneself; to endeavor very hard at a task.

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

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Meanings

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

present singular third person knocks oneself out · participle present knocking oneself out · participle past knocked oneself out · past knocked oneself out

  1. idiomaticinformalTo go ahead; to do as one pleases; to enjoy oneself; to endeavor very hard at a task.

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

    1 more example

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

Synonyms & antonyms

Also see
go nutsgo wildsuit oneself
Cite this entry
APA

knock oneself out. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/knock%20oneself%20out

MLA

“knock oneself out.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/knock%20oneself%20out. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “knock oneself out,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/knock%20oneself%20out.

Source: knock oneself out on Wiktionary, CC BY-SA 4.0.