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

Comics

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

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 * "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

Film and television

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

Other uses

* Knockouts (salon), an American salon chain * Knockout CP Freshmart (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