knockout
//ˈnɒk.aʊt//
Noun
knockoutSingular
knockoutsPlural
1
A blow that renders an opponent unconscious or unable to continue in boxing or other combat sports.
The boxer won the match by knockout in the third round.
2
A competition in which the loser of each round is eliminated.
The tournament is a knockout, so one loss means you're out.
3
An extremely attractive or impressive person or thing.
She was a knockout in that red dress.
Adjective
knockoutCanonical form
1
Extremely attractive, impressive, or successful.
She wore a knockout dress to the party.