- knockout
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/nok"owt'/, n.1. an act or instance of knocking out.2. the state or fact of being knocked out.3. a knockout blow.4. Informal. a person or thing overwhelmingly attractive, appealing, or successful.5. a panel in a casing, can, or box, esp. of metal or plastic, so designed that it can readily be removed, as by punching, hammering, or cutting, to provide an opening into the interior: a knockout in a junction box.6. Mach. a device for knocking something loose, as finished work from a lathe chuck.adj.7. that knocks out: the knockout punch.[1810-20; 1935-40 for def. 4; n., adj. use of v. phrase knock out]
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Universalium. 2010.