That knocks out; characterized by knocking out; as, a knock-out blow; a knock-out key for knocking out a drill from a collet. [Webster 1913 Suppl.]
knock-out, n.
Act of knocking out, or state of being knocked out; the act of rendering a person unconscious by a blow. [Webster 1913 Suppl.]
a blow which causes a person to become unconscious. [WordNet 1.5]
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; as, Muhammed Ali won by a knockout in the first round. [WordNet 1.5]
a strikingly beautiful woman. [PJC]
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