Usually means: Eliminating an opponent with unconsciousness.
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We found 38 dictionaries that define the word knockout:

General (21 matching dictionaries)
  1. knockout: Merriam-Webster.com
  2. knockout: Oxford Learner's Dictionaries
  3. knockout: American Heritage Dictionary of the English Language
  4. knockout: Collins English Dictionary
  5. knockout: Vocabulary.com
  6. Knockout, knockout: Wordnik
  7. knockout: Cambridge Advanced Learner's Dictionary
  8. knockout: Wiktionary
  9. knockout: Webster's New World College Dictionary, 4th Ed.
  10. knockout: The Wordsmyth English Dictionary-Thesaurus
  11. knockout: Infoplease Dictionary
  12. knockout: Dictionary.com
  13. knockout: Cambridge Essential American English Dictionary
  14. Knockout (DC Comics), Knockout (Lil Wayne song), Knockout (Triple 8 song), Knockout (UK comics), Knockout (board game), Knockout (comics), Knockout (disambiguation), Knockout (game), Knockout (game show), Knockout (professional wrestling), Knockout (web framework), Knockout, The Knockout: Wikipedia, the Free Encyclopedia
  15. knockout: Rhymezone
  16. knockout: AllWords.com Multi-Lingual Dictionary
  17. knockout: Free Dictionary
  18. knockout: Mnemonic Dictionary
  19. knockout: Dictionary/thesaurus

Business (3 matching dictionaries)
  1. Construction Term Glossary (No longer online)
  2. Comprehensive Financial (No longer online)
  3. knockout: Legal dictionary

Computing (1 matching dictionary)
  1. knockout: Encyclopedia

Medicine (3 matching dictionaries)
  1. Knockout: MedTerms.com Medical Dictionary
  2. online medical dictionary (No longer online)
  3. Knockout: Drug Medical Dictionary

Miscellaneous (1 matching dictionary)
  1. AbbreviationZ (No longer online)

Science (3 matching dictionaries)
  1. Drug Discovery and Development (No longer online)
  2. DOE Genome Glossary (No longer online)
  3. Glossary of Genetic Terms (No longer online)

Slang (3 matching dictionaries)
  1. knockout, knockout, knockout: Green’s Dictionary of Slang
  2. knockout: ESL Slang page
  3. knockout, the knockout: Urban Dictionary

Sports (2 matching dictionaries)
  1. Knockout: Fifthchair Bridge
  2. Knockout: Sports Definitions

Tech (1 matching dictionary)
  1. Schlumberger Oilfield Glossary (No longer online)

(Note: See knockouts as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  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.
noun:  The deactivation of anything.
noun:  (informal) Something wildly popular, entertaining, or funny.
noun:  (informal) A very attractive person, especially a beautiful woman.
noun:  A partially punched opening meant for optional later removal.
noun:  (genetics) The deactivation of a particular gene.
noun:  (genetics) A creature engineered with a particular gene deactivated.
noun:  (printing) An event where a foreground color causes a background color not to print.
noun:  (sports) A tournament in which a team or player must beat the opponent in order to progress to the next round.
noun:  (uncountable) A simple game for two or more players, derived from basketball.
adjective:  Rendering someone unconscious.
adjective:  Amazing; gorgeous; beautiful.
adjective:  (genetics) Designating an organism in which a particular gene has been removed or deactivated.
adjective:  Causing elimination from a competition.
noun:  Short for knockout auction. [An auction where most of the bidders are secretly shills.]

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