What does knockout mean?
Knockout is a word that carries the force of sudden, complete defeat. In sport, especially boxing and knockout tournaments, it can mean a victory earned by rendering an opponent unable to continue or by eliminating them from the competition. It can also name the decisive blow itself, while the verb “knock out” describes rendering someone unconscious or defeating them decisively. As an adjective, “knockout” describes something so powerful or striking that it overwhelms ordinary expectations: a knockout performance, knockout blow, or knockout product. The expression is common in British and American English and is often informal or promotional, although its sporting sense is established and precise. Outside sport, it can suggest domination, conspicuous excellence, or an impact strong enough to stun. The compound’s imagery is especially memorable: an opponent is knocked out at once and cannot continue the contest. That sense of abrupt, total conclusion is the key to understanding its modern figurative meanings.
A decisive victory or elimination, especially in a sport; a blow that renders someone unconscious; or, informally, something exceptionally impressive or attractive.
"The team advanced to the final with a series of knockouts."
The sporting sense is standard, while the sense for a striking person or thing is informal and especially common in North American English.
To render someone unconscious with a powerful blow or to eliminate them decisively from a competition.
"The challenger knocked out the defending champion in the second round."
Usually written as the two-word phrasal verb “knock out.” It can also mean to overwhelm with impressive performance or appearance.
Describing something so decisive, powerful, striking, or impressive that it has an overwhelming effect.
"He landed a knockout blow in the championship bout."
Common in sporting and promotional language; “knockout” as an adjective is especially associated with visual impact or striking excellence.
The plural is used for separate decisive victories, eliminations, blows, or, informally, striking people or things.
"The tournament featured several early knockouts."
Born in the boxing ring, “knockout” still captures the idea of a contest ending so decisively that the defeated party has no chance to continue.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does knockout come from?
The word is an English compound of knock and out. It developed in late-19th-century boxing language, where a knockout was a blow that left a boxer unable to rise or continue the contest. From that sporting context it spread to general language for decisive victories, eliminations, and figuratively forceful effects.
How knockout is actually used
The noun and adjective are written as one word, while the verb is normally phrasal and written as two words: knock out. The word is especially common in sporting contexts, while promotional and figurative uses may sound informal. In North American English, it can also refer to a stunningly attractive person.