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Wiktionary
knock out

vb. 1 (context transitive English) To strike or bump (someone or something) out. 2 (context transitive idiomatic English) To render unconscious, as by a blow to the head.

WordNet
knock out
  1. v. eliminate; "knock out a target"

  2. knock unconscious or senseless; "the boxing champion knocked out his opponent in a few seconds" [syn: knock cold, kayo]

  3. destroy or break forcefully; "The windows were knocked out"

  4. overwhelm with admiration; "All the guys were knocked out by her charm"

  5. empty (as of tobacco) by knocking out; "knocked out a pipe"

Wikipedia
Knock Out (Bonfire album)

Knock Out is the fourth album by the hard rock band Bonfire. It was released in 1991 on the label BMG International.

Knock Out (2010 film)

Knock Out is a Bollywood film directed by Mani Shankar. Released on 15 October 2010, the film stars Sanjay Dutt, Irfan Khan and Kangana Ranaut. Knock Out is an unauthorized remake of Phone Booth. In October 2010, the Bombay High Court ordered the film's producers to pay a portion of their revenues to 20th Century Fox who own the rights to Phone Booth. The film was a disaster at the Indian boxoffice.

Knock Out (Gottlieb pinball)

Knock Out is a pinball machine designed by Harry Mabs and released by Gottlieb in 1950. The game was marketed with the slogan: "Uproarious Slam-Bang Animation in a Real Ring on the Playfield". It should not to be confused with Knockout by Bally from 1974.

Usage examples of "knock out".

Their Phoenix missiles were designed to knock out Soviet cruise missiles as well as the bombers themselves, and if those Badgers really were searching for the Jefferson Viper Squadron might just turn the tide.

Obviously the technicians of Proton had the means to knock a robot out and to knock out an entity of Moeba, and when the charade had been exposed, these means had been used.

They all have their orders: in case of attack, knock out communications and create panic and confusion.

But he shan't git away until I give him a black eye an' knock out a couple of his front teeth fer him,'' concluded the boaster.

Harry used the opportunity to knock out one of the big man's teeth with the toe of his shoe.