knock oneself out

Verb

Meaning

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

(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."

Source: en.wiktionary.org

Synonyms

aim strive toil overwork bend over backwards buckle down knuckle down pull out all the stops plug away have a go kill oneself leave no stone unturned peg away beaver away go wild
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Antonyms

loaf lie breathe lounge loll skive
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Close letter words and terms

knock one out of the ballpark knock one out of the park knock oneself knock out knock out of place knock out of position