From WordNet (r) 2.0 (August 2003) [wn]:
knockout
adj : very strong or vigorous; "strong winds"; "a hard left to the
chin"; "a knockout punch"; "a severe blow" [syn:
hard, severe]
n 1: a very attractive or seductive looking woman [syn:
smasher, stunner, beauty, ravisher,
sweetheart, peach, lulu, looker, mantrap,
dish]
2: a blow that renders the opponent unconscious [syn: KO]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Knock-out \Knock"-out`\, a.
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.] knockout
From The Collaborative International Dictionary of English v.0.48 [gcide]:
knockout \knock"out`\, knock-out \knock"-out`\, n.
Act of knocking out, or state of being knocked out; the act
of rendering a person unconscious by a blow. [WordNet sense
1]
[Webster 1913 Suppl. + WordNet 1.5]
2. a blow which causes a person to become unconscious.
Syn: knockout blow, knockout punch.
[WordNet 1.5]
3. (Boxing) 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]
4. a strikingly beautiful woman. [Informal]
[PJC] knockout drops