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knockout (n.)

also knock-out, in fighting, 1887, from verbal phrase knock out "to stun by a blow for a 10-count" in boxing, short for to knock out of time; see knock (v.) + out (adv.). Slang meaning "excellent thing or person" is from 1892; specifically "beautiful woman" by 1953. As an adjective from 1896 in the tournament competition sense, 1898 in fighting. To knock oneself out "make a great effort" is from 1936.

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Definitions of knockout from WordNet
1
knockout (n.)
a very attractive or seductive looking woman;
Synonyms: smasher / stunner / beauty / ravisher / sweetheart / peach / lulu / looker / mantrap / dish
knockout (n.)
a blow that renders the opponent unconscious;
Synonyms: ko / kayo
2
knockout (adj.)
very strong or vigorous;
a knockout punch
Synonyms: hard / severe
From wordnet.princeton.edu