knock out

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English[edit]

Verb[edit]

knock out (third-person singular simple present knocks out, present participle knocking out, simple past and past participle knocked out)

  1. (transitive) To strike or bump (someone or something) out.
    I accidentally knocked out the glass in my picture frame.
  2. (transitive, idiomatic) To render unconscious, as by a blow to the head.
    The boxer knocked out his opponent in the third round.
    • 1918, W. B. Maxwell, chapter 22, The Mirror and the Lamp:
      In the autumn there was a row at some cement works about the unskilled labour men. A union had just been started for them and all but a few joined. One of these blacklegs was laid for by a picket and knocked out of time.
  3. (transitive, idiomatic) To put to sleep.
    The allergy pill knocked him out for a good three hours.
  4. (transitive, idiomatic) To exhaust.
    Running errands all day really knocked him out.
  5. (transitive, idiomatic) To complete, especially in haste; knock off.
    They knocked out the entire project in one night.
  6. (transitive, idiomatic) To cause a mechanism to become non-functional by damaging or destroying it.
    The antitank gun knocked out the enemy tank.
  7. (sports) To eliminate.
    • 2011 December 15, Marc Higginson, “Shamrock Rovers 0-4 Tottenham”, BBC Sport:
      Tottenham were knocked out of the Europa League, despite a comfortable victory over Shamrock Rovers in Dublin.

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