Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The act of knocking out.
  • n. The state of being knocked out.
  • n. A blow that knocks out an opponent.
  • n. Sports A victory in boxing in which one's opponent is unable to rise from the canvas within a specified time after being knocked down or is judged too injured to continue.
  • n. Sports The act of winning a boxing match in this way: won the fight by a knockout.
  • n. Slang A strikingly attractive or impressive person or thing.
  • adj. Capable of knocking out: a knockout punch.
  • adj. Strikingly attractive or impressive.
  • adj. Having a specific single gene removed from the genome by genetic manipulation: knockout mice used in an experiment.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The act of making someone unconscious, or at least unable to come back on their feet within a certain period of time; a TKO.
  • n. The deactivation of anything.
  • n. Something wildly popular, entertaining, or funny.
  • n. A very attractive person, especially a beautiful woman.
  • n. A partially punched opening meant for optional later removal.
  • n. The deactivation of a particular gene.
  • n. A creature engineered with a particular gene deactivated.
  • n. An event where a foreground color causes a background color not to print.
  • n. A tournament, in which a team or player must beat the opponent in order to progress to the next round.
  • adj. Rendering someone unconscious.
  • adj. Amazing; gorgeous; beautiful.
  • adj. Designating an organism in which a particular gene has been removed or deactivated.
  • adj. Causing elimination from a competition

from the GNU version of the Collaborative International Dictionary of English

  • n. Act of knocking out, or state of being knocked out; the act of rendering a person unconscious by a blow.
  • n. a blow which causes a person to become unconscious.
  • n. the winning of a boxing contest by rendering the opponent unable to stand for a specified period, usually a count of ten; -- in contrast to a win by a decision.
  • n. a strikingly beautiful woman.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. very strong or vigorous
  • n. a very attractive or seductive looking woman
  • n. a blow that renders the opponent unconscious

Etymologies

From knock out. (Wiktionary)

Examples

  • Several rodent models have identified UDT in knockout models of hoxa10, hoxa11, hox13, cgrp, insl3, and great genes.

    Urology Division Research

  • I was known as a knockout artist with one punch and was dubbed the dirtiest fighter on the continent.

    Blue Rage, Black Redemption

  • Winners by knockout: Of the 16 nations that have progressed to the second round of the World Cup, the three most successful in knockout matches are Italy, Brazil and Germany.

    USATODAY.com - Agoos out 4-6 weeks; half of back line out

  • Today's "lab rat" is a technological marvel -- and also happens to be, in most instances, what is called a "knockout mouse."

  • In his 3rd fight in France, Drayton, had another non-title knockout, in 2 rounds over Mexican Juan Alonso Villa, (14-5), in Val-de-Marne.

    Doghouse Boxing News

  • There may not be a short-term knockout, so Dems should prepare as if they're trying to win by decision.

    Obsidian Wings

  • Another knockout is the chillingly well-made documentary "The Imposter," about Frédéric Bourdin, a French con-artist who posed as a missing child and was welcomed into the child's family home in Texas.

    Scrounging for Swedish Fish at Sundance

  • The toolbox of experimental genetic methods developed by Capecchi, Evans and Smithies, commonly called the knockout technology, has permitted scientists to determine the role of specific genes in development, physiology, and pathology.

    The 2007 Nobel Prize in Physiology or Medicine - Advanced Information

  • Then comes the so-called knockout stage, 16 teams.

    CNN Transcript Jun 10, 2006

  • A knockout is a finality not afforded to cubicle dwellers.

    SI.com

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  • Nigerian English - firework(s).

    June 21, 2009