knock oneself out

= try very hard, making oneself very tired

I knocked myself out writing the document through the night.

Notice: There is another idiom "be knocked out" that means "very tired".

I was too knocked out to go out for drinking yesterday.

Refs

• All Clear 3, Helen Kalkstein Fragiadakis

idiom, 15-01-05 10:47, 15-01-05 10:47, Yosei