knockout

1 knockout /ˈnɑːkˌaʊt/ noun
plural knockouts
1 knockout
/ˈnɑːkˌaʊt/
noun
plural knockouts
Britannica Dictionary definition of KNOCKOUT
[count]
1 
: an occurrence in which a boxing match ends when a fighter has been knocked down by a punch and is unable to start fighting again before 10 seconds have passed
— see also technical knockout
2 
informal : a very attractive or appealing person or thing — see also knock out at 1knock
2 knockout /ˈnɑːkˌaʊt/ adjective
2 knockout
/ˈnɑːkˌaʊt/
adjective
Britannica Dictionary definition of KNOCKOUT
always used before a noun
1 
: causing someone to become unconscious
2 
informal : extremely attractive or appealing
3 
British, of a contest or competition : designed so that winning teams or players continue to play and losing teams or players do not