knockout

American  

[nok-out] / ˈnɒkˌaʊt /

noun

• knockouts
  plural

1. an act or instance of knocking out.

2. the state or fact of being knocked out.

3. a knockout blow.

4. Informal. a person or thing overwhelmingly attractive, appealing, or successful.

5. a panel in a casing, can, or box, especially of metal or plastic, so designed that it can readily be removed, as by punching, hammering, or cutting, to provide an opening into the interior.

   a knockout in a junction box.

6. Machinery. a device for knocking something loose, as finished work from a lathe chuck.

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adjective

1. that knocks out.

   the knockout punch.

knockout British  

/ ˈnɒkˌaʊt /

noun

1. the act of rendering unconscious

2. a blow that renders an opponent unconscious

3. 1. a competition in which competitors are eliminated progressively

   2. ( as modifier )

      a knockout contest

4. a series of absurd invented games, esp obstacle races, involving physical effort or skill

5. informal a person or thing that is overwhelmingly impressive or attractive

   she's a knockout

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verb

1. to render unconscious, esp by a blow

2. boxing to defeat (an opponent) by a knockout

3. to destroy, damage, or injure badly

4. to eliminate, esp in a knockout competition

5. informal to overwhelm or amaze, esp with admiration or favourable reaction

   I was knocked out by that new song

6. to remove the ashes from (one's pipe) by tapping

Other Word Forms

Noun Inflected Forms

• knockouts
  plural

Etymology

Origin of knockout

1810–20; 1935–40 knockout for def. 4; noun, adj. use of verb phrase knock out

Explanation

In the sport of boxing, a knockout is a blow that sends one of the boxers to the mat, unable to continue fighting. If you are down and can't rise before the ref counts to ten, consider it a knockout. In full-contact fighting sports, including boxing, karate, and kickboxing, the ultimate goal is a match-winning knockout of the opponent. Not all boxing matches end this way, but a knockout is the most exciting (and dangerous) way for a match to end. This word is also used to mean "gorgeous person," so if someone tells you you're a knockout, you can be sure they mean it as a compliment.

Example Sentences

See Examples For:

knockout knockouts

A 33rd stoppage triumph, in what would be Serrano's 50th professional victory, would give her the most knockout wins in women's boxing history, eclipsing pioneer Christy Martin.

From BBC ● Aug. 21, 2026

They have a healthy lead, but a knockout blow needs to be landed in a week, as you have to imagine it will be.

From BBC ● Aug. 19, 2026

After a headline-snatching first senior century on Tuesday, the 18-year-old's One-Day Cup drew to a close with 22 in Lancashire's defeat by Durham in the knockout stage on Friday.

From BBC ● Aug. 15, 2026

Colon was undefeated in 16 fights with 13 wins by knockout before facing Williams in Fairfax, Virginia.

From BBC ● Aug. 14, 2026

All I do is sink to my knees, felled by the words that could deliver such a knockout blow.

From "I Am the Messenger" by Markus Zusak

She will also be looking to extend her record as the woman with the most knockouts, with 21.

From BBC ● Aug. 21, 2026

Itauma, 21, has been widely tipped as the next star of heavyweight boxing, with 12 knockouts in 14 professional victories.

From BBC ● Aug. 4, 2026

Manchester City's Erling Haaland, who went out at the quarter-final stage with Norway, might say otherwise, while midfielder Mikel Merino - of Arsenal - has arguably been Spain's key man in the knockouts.

From BBC ● Jul. 14, 2026

In the knockouts, some of the European nations have also impressed when dealing with adversity.

From BBC ● Jul. 8, 2026

Louis had battled his way through twenty-seven professional matches with twenty-three knockouts and no defeats to reach his current status as the number one challenger in the world.

From "The Boys in the Boat: Nine Americans and Their Epic Quest for Gold at the 1936 Berlin Olympics" by Daniel James Brown

Related Words

• technical knockout