don't knock yourself out

Don't expend too much energy or try too hard (doing something), as it isn't worth the trouble. You can clean the house if you want, but don't knock yourself out—the kids will just make a mess of it again anyway.

See also: knock, out

Farlex Dictionary of Idioms.

See also:

cast (one's) lot in with (someone or something)
cast lot in
cart before the horse, don't put/set the
don't get me wrong
don't beat a dead horse
all in (one's) head
come it
come it (with one)
(I) won't tell a soul

References in periodicals archive

So don't knock yourself out removing the seat or you just might knock out the sensor surveyor unit!

Co-pilot seat maintenance

词组	don't knock yourself out
释义	don't knock yourself out don't knock yourself out Don't expend too much energy or try too hard (doing something), as it isn't worth the trouble. You can clean the house if you want, but don't knock yourself out—the kids will just make a mess of it again anyway. See also: knock, out Farlex Dictionary of Idioms. See also: cast (one's) lot in with (someone or something) cast lot in cart before the horse, don't put/set the don't get me wrong don't beat a dead horse all in (one's) head come it come it (with one) (I) won't tell a soul References in periodicals archive So don't knock yourself out removing the seat or you just might knock out the sensor surveyor unit! Co-pilot seat maintenance
随便看	move move about move ahead of move ahead (of someone or something) move along move a muscle move around move around and move about move aside move at a fast clip move away move away from (something) move back move backward move down moved to tears move for move for (something) move forward move forward with place (someone or something) (up) on a pedestal place (something) at a premium place the blame for (something) on (someone or something) place the blame on place the blame on (someone or something)