adj
knockout
NOK-owt
adj
1
Strong or effective enough to render someone unconscious.
"He won the fight with a knockout punch in the second round."
2
Strikingly attractive or impressive.
"She wore a knockout red dress to the premiere."
How to Use Knockout
Learner’s notesIn plain EnglishDescribing something powerful enough to floor an opponent, or, informally, someone stunningly attractive.
Common pairings
a knockout punch
a knockout dress
a knockout performance
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He won the fight with a _____ punch in the second round.
Etymology
A noun/adjective formed from the phrasal verb "knock out."