knock out

Short definition from Wiktionary

Verb

1. 1
   To strike or render unconscious: To strike or bump (someone or something) out.
2. 2
   To strike or render unconscious: To render unconscious, as by a blow to the head.
3. 3
   To strike or render unconscious: To put to sleep.
4. 4
   To strike or render unconscious: To fall asleep, especially suddenly.
5. 5
   To strike or render unconscious: To exhaust.
6. 6
   To strike or render unconscious: To impress, surpass or overwhelm (someone).
7. 7
   To strike or render unconscious: To defeat or kill (someone).
8. 8
   To strike or render unconscious: To cause a mechanism to become non-functional by damaging or destroying it.
9. 9
   To strike or render unconscious: To eliminate from a contest or similar.
10. 10
    To communicate (a message) by knocking.
11. 11
    To complete, especially in haste; knock off.
12. 12
    To lose the scent of hounds in fox-hunting.
13. 13
    To leave college after hours—after half-past ten at night when the doors have been locked.
14. 14
    To obtain or earn (something, often money or food).
15. 15
    To sell.

Noun

1. 1
   Alternative form of knockout.