Definition of "knockout"
knockout
/ˈnɒk.aʊt/
noun
plural knockouts
(informal) A very attractive person, especially a beautiful woman.
(genetics) The deactivation of a particular gene.
(genetics) A creature engineered with a particular gene deactivated.
adjective
not comparable
(genetics) Designating an organism in which a particular gene has been removed or deactivated.