knock for a loop

don't knock yourself out

Don't overexert yourself (in doing something that does not require much effort).

keep someone in the loop

To furnish someone with sufficient relevant information and include them in the decision-making process.

knock down a peg

Synonym of take down a notch.

knock it off

to tell someone to stop doing something annoying or wrong.

knock on heaven's door

To die or be close to death.

knock on wood

To take a customary action to ward off some misfortune that is believed to be attracted by a presumptuous statement.

knock oneself out

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

knock out

To strike or render unconscious