Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • transitive verb To knock out, as in boxing.
  • noun A knockout, as in boxing.

from The Century Dictionary.

  • An obsolete or dialectal contraction of quoth.
  • noun A Chinese unit of customary enumeration, in connection with certain classes of things: as, yi ko jin, a man or ‘one man’ (usually rendered in pidgin-English ‘one piecey man’).
  • noun An abbreviation of kathodic opening contraction.

from the GNU version of the Collaborative International Dictionary of English.

  • noun acronym a knockout; a blow that renders the opponent unconscious; -- used especially in boxing.
  • transitive verb acronym To knock out; to deliver a blow that renders (the opponent) unconscious; -- used especially in boxing.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun boxing A knock out.
  • verb transitive (boxing) To knock somebody out, to render somebody unconscious.

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

  • noun a blow that renders the opponent unconscious

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Initialism of knock out.

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