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knockout2 informal
1
knockout punch/blow
a) a hard hit that knocks someone down so that they cannot get up again
b) an action or event that causes defeat or failure : 
High interest rates have been a knockout blow to the business.
High interest rates have been a knockout blow to the business.2 relating to a type of competition in which only the winning players or teams at each stage continue to play : Scotland's failure to get through the knockout stage of the competition
Scotland's failure to get through the knockout stage of the competition
