The meaning of KNOCKOUT is the act of knocking out : the condition of being knocked out. How to use knockout in a sentence.

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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 …

an act or instance of knocking out. the state or fact of being knocked out. a knockout blow. Informal., a person or thing overwhelmingly attractive, appealing, or successful.

knockout noun [C] (COMPETITION) (US elimination tournament) a competition in which only the winners of each stage play in the next stage, until one competitor or team is the final winner:

knock•out (ˈnɒkˌaʊt) n. 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 …

a panel in a casing, can, or box, esp. 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 …

If you describe someone or something as a knockout, you think that they are extremely attractive or impressive.

(informal) a person or thing that is very attractive or impressive She's an absolute knockout. Definition of knockout noun in Oxford Advanced American Dictionary. Meaning, pronunciation, …

Oct 31, 2025 · knockout (plural knockouts) The act of making one unconscious, or at least unable to come back on one's feet within a certain period of time; a TKO.