knock

To strike with a hard blow.

To affect in a specified way by striking hard.

To cause to be displaced or unengaged; force.

To cause to collide.

To produce by hitting or striking.

To find fault with; criticize.

To strike a sharp audible blow or series of blows, as on a door.

To collide with something.

To make a pounding or clanking noise.

An instance of striking or colliding.