As a Noun: 1. In boxing, a blow or punch that makes one of the boxers fall to the floor and not be able to stand up before the referee has counted to ten. English = knockout. 2. A competition in which the winner of each match goes on to the next round, until one competitor or team is the winner. English = knockout competition. As a Verb or Adjective: 1. In boxing, to punch your opponent so that he falls to the floor and is not able to stand up before the referee has counted to ten. English = knockout.