Meaning of the word "knock oneself out" in English

What does "knock oneself out" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

knock oneself out

US /nɑk wʌnˈsɛlf aʊt/
UK /nɒk wʌnˈsɛlf aʊt/

Idiom

1.

to work extremely hard or make a great effort, often to the point of exhaustion, or to do something with great enthusiasm

Example:
He'll knock himself out trying to finish the project on time.
Don't knock yourself out trying to please everyone.
2.

(informal) used to tell someone to go ahead and do something, often implying that it won't be successful or that you don't care

Example:
You want to try and fix it yourself? Go ahead, knock yourself out.
If you think you can convince him, knock yourself out.