To strike or bump (someone or something) out.
To fall asleep, especially suddenly.
To lose the scent of hounds in fox-hunting.
To eliminate from a contest or similar.
To put to sleep.
To complete, especially in haste; knock off.
To render unconscious, as by a blow to the head.
To exhaust.
To cause a mechanism to become non-functional by damaging or destroying it.
To communicate (a message) by knocking.
Engage in rough-and-tumble activity
An environment of rough activity
Rough activity; fighting or brawling; a fight.
A person who characteristically engages in such activity
active, vigorous and rough, with the possibility of harm
highly competitive