knockout A knockout (abbreviated to KO or K.O.) is a fight-ending, winning criterion in several full-contact combat sports, such as boxing, kickboxing, Muay Thai, mixed martial arts, karate, some forms of taekwondo and other sports involving striking, ...

, in several sports, is a strike that renders an opponent unable to continue fighting. Knockout may also refer to:

Sports and games

* ''Knock Out'' (Gottlieb pinball), a 1950 pinball machine *

Knock Out (kickboxing) Knock Out (stylized as KNOCK OUT) is a Japanese martial arts promotion and brand established in 2016 by the Bushido Road subsidiary Kixroad. It is currently run by Def Fellow. In 2019, the promotion established two different rulesets. The Knock ...

, a Japanese kickboxing promotion * ''Knock Out'' (tabletop game), a tabletop game by the Milton Bradley Company * Knockout (game), a basketball-related activity *

Knockout Cup (speedway) Knockout Cup (sometimes referred to as the KO Cup) is a type of British motorcycle speedway competition, examples of which have run annually since 1929. Each tier of British Speedway has its own respective Knockout Cup. The current Knockout Cu ...

, a British motorcycle speedway competition * Knockout system, a tournament format divided into successive rounds *

Knockout tournament A single-elimination knockout, or sudden-death tournament is a type of elimination tournament where the loser of a match-up is immediately eliminated from the tournament. Each winner will play another in the next round, until the final match-up, w ...

, a single-elimination tournament * New England Knockouts, an American professional baseball team in Massachusetts *

Technical knockout A knockout (abbreviated to KO or K.O.) is a fight-ending, winning criterion in several full-contact combat sports, such as boxing, kickboxing, Muay Thai, mixed martial arts, karate, some forms of taekwondo and other sports involving striking, a ...

(TKO), a knockout called by an official for safety reasons * "

TNA Knockout Knockout is a term used by Total Nonstop Action Wrestling (TNA) to refer to its female talent. The term is applied universally to professional wrestling, wrestlers, backstage interviewers, and manager (professional wrestling), managers/valets. H ...

", a term used by Total Nonstop Action Wrestling to refer to its female talent * Knockout Tour, a playable game mode in the 2025 Switch 2 game ''

Mario Kart World is a 2025 kart racing game developed and published by Nintendo for the Nintendo Switch 2. As in previous ''Mario Kart'' games, players control ''Mario'' characters as they race against opponents. ''World'' introduces an open-world design and mod ...

Comics

* ''Knockout'' (UK comics), either of two British comic books *

Knockout (DC Comics) Knockout is a supervillain in the DC Comics universe. She first appeared in ''Superboy'' (vol. 4) #1 (February 1994), and was created by Karl Kesel and Tom Grummett. A former Female Fury warrior from the hellish planet Apokolips like Big Barda, K ...

, a comic book character * Knock Out (''Transformers: Prime''), a fictional robot supervillain turned superhero * Knockout, a '' Femme Fatales'' comics character

Literature

* ''Knock-Out'' (novel), a Bulldog Drummond novel * ''Knockout: Interviews with Doctors Who Are Curing Cancer – And How to Prevent Getting It in the First Place'', a book by

Suzanne Somers Suzanne Marie Somers (; October 16, 1946 – October 15, 2023) was an American actress, author, and businesswoman. She played the television roles of Chrissy Snow on ''Three's Company'' (1977–1981) and Carol Foster Lambert on '' Step by Step' ...

Music

* Knockout Entertainment, an American record label * ''Knock Out'' (Bonfire album) (1991), album by the hard rock band Bonfire * "Knockout" (Triple 8 song) (2003), a song by the British pop/rock group Triple 8 ** "

Twins (Knock Out) "Knockout" is the debut single recorded by the United Kingdom, British pop music, pop/rock music, rock group Triple 8, released on 21 April 2003 in the United Kingdom. The single reached a peak position of number 8 on the UK Singles Chart. Track ...

", a cover version by Super Junior * "Knockout" (Lil Wayne song) (2010), song by Lil Wayne from his album ''Rebirth'' * "K.O." (Pabllo Vittar song) (2017), song by Pabllo Vittar from her album ''Vai Passar Mal'' * ''TKO'' (The Knock Out), 2018 album by Mya * ''Knock Out!'', a 1981 album by

Toots and the Maytals The Maytals, known from 1972 to 2020 as Toots and the Maytals, are a Jamaican musical group, one of the best known ska and rocksteady vocal groups. The Maytals were formed in the early 1960s and were key figures in popularizing reggae music. ...

* "Knockout" (Bon Jovi song), song from 2016 album ''This House Is Not for Sale'' * "Knock Out" (GD & TOP song), 2011 song by GD & TOP for their self-entitled album * "Knockout" (2019), a song by

Martin Tungevaag Martin Tungevåg (born July 9, 1993), known professionally as Martin Tungevaag or simply Tungevaag, is a Norwegian DJ and music producer who placed at number #89 on the ''DJ Mag'' top 100 DJs list. He has achieved success in Europe, Asia and Sou ...

Film and television

* ''

The Knockout ''The Knockout'' is a 1914 American silent comedy film starring Roscoe "Fatty" Arbuckle. It also features Charlie Chaplin in a small role, his seventeenth film for Keystone Studios. It is one of only a few films in which Chaplin's Little Tr ...

'', a 1914 Keystone Studios film with Fatty Arbuckle and Charlie Chaplin. * ''The Knockout'' (1923 film), a 1923 British silent sports film directed by Alexander Butler * ''The Knockout'' (1925 film), a silent drama directed by Lambert Hillyer * ''Knockout'' (1935 film), a German sports film * ''Knockout'' (1941 film), a 1941 American drama directed by William Clemens * ''Knock Out'' (1943 film), a 1943 Italian crime film directed by Carmine Gallone * ''Knockout'' (2000 film), an American film about a female boxer * ''Knock Out'' (2010 film), an Indian Hindi-language action-thriller film * ''Knockout'' (2011 film) or ''Born to Fight'', a Canadian film * ''Haywire'' (2011 film) or ''Knockout'', a 2011 American film * ''Knockout'' (game show), a 1977–78 NBC series hosted by Arte Johnson * ''Knockout'' (Indonesian TV series), a game show * ''The Knockout'' (Chinese TV series), a 2023 Chinese TV series directed by Xu Jizhou

Information technology

Knockout (web framework) Knockout is a standalone JavaScript implementation of the Model–View–ViewModel pattern with templates. The underlying principles are therefore: * a clear separation between domain data, view components and data to be displayed * the presen ...

, a JavaScript library * Image knockout, removing the background from an image

Material removal

Knock-outs An electrical enclosure is a Cabinetry, cabinet for Electrical equipment, electrical or electronic equipment to mount switches, Control knob, knobs and Display device, displays and to prevent electrical shock to equipment users and protect t ...

, partially punched enclosure openings for optional removal *

Knockout punch In metalworking, a knockout punch, also known as a chassis punch, panel punch, Greenlee punch, or a Q-max, is a hand tool used to punch a hole through sheet metal. It is a very simple tool that consists of a punch, die, and screw. There are t ...

, a metalworking tool * Knock-out pot, a vapor–liquid separator

Other uses

* Knockouts (salon), an American salon chain *

Knockout CP Freshmart Thammanoon Niyomtrong (, born 20 September 1990), known by his ring name Knockout CP Freshmart, is a Thai professional boxer and former Muay Thai fighter who held the World Boxing Association (WBA) mini-flyweight title from 2016 to 2020, and the ...

(born 1990), Thai boxer and former Muay Thai fighter * Knock-out option, a barrier option in financial markets * Knockout game, a criminally violent activity *

Gene knockout Gene knockouts (also known as gene deletion or gene inactivation) are a widely used genetic engineering technique that involves the gene targeting, targeted removal or inactivation of a specific gene within an organism's genome. This can be done t ...

, molecular biology technique * Operation Knockout, a military campaign *

Reversing type Reversing type (also reversing, knocking-out, reversed type) is a method of typographic printing with black or colored inks, in which the entire surface is printed, except for text elements. Reversing is one of the special cases of printing on a c ...

, also known as knocking out, a method of typographic printing * Touchless knockout, fraudulent practice and claims of knocking out an opponent without making physical contact