The initial idioms of the letter K

knock (one's) head against a (brick) wall	knock (someone) down a notch (or two)
knock (someone) down a peg (or two)	knock (someone) out of the box
knock about	knock against
knock Anthony	knock around
knock at	knock away
knock back	knock back a drink
knock block off	knock boots
knock cold	knock dead
knock down	take down a peg
cut down	knock down with a feather
knock for a loop	knock for six
knock galley-west	knock head against a brick wall
knock into	knock into a cocked hat
knock into shape	knock it off
Knock it off!	knock knees together