KNOCKOUT

I. noun Date: 1887 1. the act of knocking out ; the condition of being knocked out, b. the termination of a boxing match when one boxer has been knocked down and is unable to rise and resume boxing within a specified time, technical ~ , a blow that knocks out an opponent, a sensationally striking, appealing, or attractive person or thing, II. adjective Date: 1818 causing a ~ , sensationally striking, appealing, or attractive , having all or part of a gene eliminated or inactivated by genetic engineering