"knockout" in the noun sense
1. smasher, stunner, knockout, beauty, ravisher, sweetheart, peach, lulu, looker, mantrap, dish
a very attractive or seductive looking woman
2. knockout, KO, kayo
a blow that renders the opponent unconscious
"knockout" in the adjective sense
1. hard, knockout, severe
very strong or vigorous
"a hard left to the chin"
"a knockout punch"
"a severe blow"
Source: WordNet® (An amazing lexical database of English)
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