knock the living daylights out of

beat the daylights out of

To beat (someone) severely.

don't call me sir, I work for a living

Used by senior enlisted military personnel to indicate that they are not commissioned officers.

don't knock yourself out

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

knock down a peg

Synonym of take down a notch.

knock for a loop

To astonish; to stagger or overwhelm; to confuse or disorient.

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.