To knock is to strike, often with a tendency to displace the object struck;
It also means to strike repeatedly:
To knock someone down;
To knock at a door.
See also beat.
To hit sharply, as with a hand, fist, weapon, or implement:
Struck the table in anger;
Strikes the ball with a nine iron;
Struck the nail with a hammer.
To inflict (a blow).
To penetrate or pierce:.
To hit (someone or something) in a forceful way;
To cause (something) to hit something in a forceful way