to strike (a surface) sharply with the knuckles or a hard object
to drive, force, make, or remove (something) by striking
to knock a hole in the wall
to remove or subtract (an amount) from a larger total
Her earnings would be knocked off her mother's benefit — The Times
to cause (one thing) to collide with another or (things) to collide with each other
informal to find fault with; to criticize (something or somebody)
always knocking those in authority
informal to have sexual intercourse with (somebody)
to strike a surface with a sharp audible blow, esp to strike a door seeking admittance
to collide
to make a sharp pounding noise
said of an internal-combustion engine: to make a metallic rapping noise because of a mechanical defect
informal to find fault
informal to be growing old
informal to put an end to or prevent the development of (an idea, plan, etc)
informal to surpass or outdo (something or somebody) with ease
to make or assemble (something), esp hurriedly or in a makeshift way