AskDefine | Define knockout

Dictionary Definition

knockout adj : very strong or vigorous; "strong winds"; "a hard left to the chin"; "a knockout punch"; "a severe blow" [syn: hard, severe]


1 a very attractive or seductive looking woman [syn: smasher, stunner, beauty, ravisher, sweetheart, peach, lulu, looker, mantrap, dish]
2 a blow that renders the opponent unconscious [syn: KO]

User Contributed Dictionary



  1. The act of making someone unconscious, or at least unable to come back on their feet within a certain period of time; a TKO.
    The boxer scored a knockout on his opponent.
  2. Something wildly popular, entertaining, or funny.
    If you've ever had a sack race, you know it's a real knockout for kids and adults alike.
  3. A very attractive person, especially a beautiful woman.
    • 1995, Rhonda K. Reinholtz et al., "Sexual Discourse and Sexual Intercourse," in P. J. Kalbfleisch and M. J. Cody, eds., Gender, Power, and Communications in Human Relationships, p. 150,
      Phrases such as "she bowled me over," "she's striking," and "she's a knockout" suggest that the woman affects the man in ways he cannot mediate or control.
  4. A partially punched opening meant for optional later removal.
    They left a knockout in the panel for running extra wires someday.
  5. The deactivation of a particular gene.
  6. An event where a foreground color causes a background color not to print.


act of making someone unconscious
  • Croatian: nokaut
  • Finnish: tyrmäys


  1. Rendering someone unconscious.
    He delivered a knockout blow.
  2. Stunning; amazing; gorgeous.
    You should have seen her knockout eyes.


Rendering someone unconscious
Stunning; amazing; gorgeous

Extensive Definition

KO redirects here. For other uses, see Ko. For other uses of knockout, see Knockout (disambiguation).
A knockout (also referred to as a K.O.) is a winning criterion in several full-contact combat sports, such as boxing, kickboxing, Muay Thai, mixed martial arts and others sports involving striking. A knockout is usually awarded when one participant is unable to rise from the canvas within a specified period of time, typically because of fatigue, injury (serious or temporarily incapacitating, e.g. a bleeding cut above the eye can blind a fighter), loss of balance, or unconsciousness. A technical knockout (also referred to as a T.K.O.) is often declared when the referee or other judges (such as official ring physician, the fighter himself, or the fighter's cornermen) decide that a fighter cannot continue the match, even though he did not fail the count. British records refer to TKOs as either "retired", if the fighter refuses to continue, or "R.S.F.", for Referee Stopped Fight.

Physical characteristics

There is actually very little known about what exactly causes a knockout but many agree it has to do with minor trauma to the brain stem. This usually happens when the head rotates sharply, often caused by a strike. A common misconception is that a knockout is caused by compression put on the carotid arteries in the neck restricting blood flow, but this is in fact how a choke out works. A basic principle of boxing is to defend against this vulnerability by keeping both hands raised about the face.
A fighter who suffers a concussion and becomes unconscious from a strike with sufficient knockout power is referred to as having been knocked out or kayoed (KO'd). Losing balance without losing consciousness is referred to as being knocked down ("down but not out"). Repeated blows to the head are known to gradually cause permanent brain damage, with Alzheimer- or Parkinson's-like symptoms, and in severe cases may cause strokes or paralysis. This is commonly known as becoming "punch-drunk". Because of this, many physicians advise against sports involving knockouts.

As a winning outcome

In boxing, a knockout occurs when a fighter is knocked down and does not get up within 10 seconds, as counted by the referee.


knockout in Bulgarian: Нокаут
knockout in Danish: Knockout
knockout in German: Knockout (Sport)
knockout in Spanish: Nocaut
knockout in French: Knockout
knockout in Indonesian: KO
knockout in Italian: Knock-out
knockout in Hebrew: נוקאאוט
knockout in Dutch: Knock-out
knockout in Japanese: ノックアウト
knockout in Norwegian: Knockout
knockout in Polish: Nokaut
knockout in Kölsch: Knock out
knockout in Russian: Нокаут
knockout in Swedish: Knock out
knockout in Thai: ที.เค.โอ.

Synonyms, Antonyms and Related Words

Cadmean victory, KO, Miss America, Pyrrhic victory, ace, ascendancy, bathing beauty, beau ideal, beaut, beauty, beauty contest winner, beauty queen, belle, blackout, bunny, catalepsy, catatonia, catatony, championship, charmer, clincher, coma, conquest, corker, coup de grace, cover girl, crackerjack, crusher, daisy, dandy, darb, dazzler, death stroke, deathblow, dilly, dream, easy victory, enchantress, end-all, ender, eyeful, faint, final stroke, finisher, finishing stroke, grand slam, grayout, great beauty, hit, honey, humdinger, kayo, kayo punch, killer-diller, knockout blow, lady fair, landslide, landslide victory, last dab, lipothymia, lipothymy, lollapaloosa, looker, lovely, lulu, mastery, model, moral victory, nirvana, nirvana principle, nothingness, oblivion, obliviousness, paragon, peach, picnic, pinup, pinup girl, pip, pippin, pushover, pussycat, quietus, raving beauty, reigning beauty, runaway victory, semiconsciousness, sensation, senselessness, settler, sex kitten, sleep, slick chick, smash, smash hit, sockdolager, stopper, stunner, stupor, subdual, subduing, success, sweetheart, swoon, syncope, the nuts, total victory, triumph, unconsciousness, victory, walkaway, walkover, whiz, win, winner, winning, winning streak
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