knock%20out

verb

1. 1

   To strike or bump (someone or something) out.

   “I accidentally knocked out the glass in my picture frame.”

2. 2

   To render unconscious, as by a blow to the head.

   “The boxer knocked out his opponent in the third round.”

3. 3

   To put to sleep.

   “The allergy pill knocked him out for a good three hours.”

4. 4

   To exhaust.

   “Running errands all day really knocked him out.”

5. 5

   To complete, especially in haste; knock off.

   “They knocked out the entire project in one night.”

6. 6

   To cause a mechanism to become non-functional by damaging or destroying it.

   “The antitank gun knocked out the enemy tank.”

7. 7

   To eliminate.

8. 8

   To communicate (a message) by knocking.

   “The prisoner knocked out a message on the wall for the prisoner in the adjoining cell.”

9. 9

   To lose the scent of hounds in fox-hunting.

10. 10

    (Oxford University slang) To leave college after hours—after half-past ten at night when the doors has been locked.