knockout

(noun) a very attractive or seductive looking woman. Synonyms: smasher, stunner, beauty, ravisher, sweetheart, peach, lulu, looker, mantrap, dish.

(noun) a blow that renders the opponent unconscious. Synonyms: KO, kayo.

(adj) very strong or vigorous. Synonyms: hard, severe. Examples: "Strong winds." "A hard left to the chin." "A knockout punch." "A severe blow."