1knock·out 
/ˈnɑ:kˌaʊt/ noun
plural knock·outs /ˈnɑ:kˌaʊt/ noun [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
▪ He won the match by a knockout. ▪ He scored a knockout in the fourth round. — see also technical knockout 2 informal : a very attractive or appealing person or thing
▪ She's a real knockout in that dress. — see also knock out at 1knock
▪ He won the match by a knockout. ▪ He scored a knockout in the fourth round. — see also technical knockout
▪ She's a real knockout in that dress. — see also knock out at 1knock
