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• v  knock unconscious or senseless
• s  knocked unconscious by a heavy blow

• He was gashed and kayoed when bumpy air over the troublesome Nittany Mountains conked him against an overhead baggage rack.
• Lucian ("Sonny") Banks, 24, journeyman heavyweight boxer from Detroit, whose main claim to fame was his 1962 knockdown of Cassius Clay (Clay kayoed Banks four rounds later); of a .
• A convict turned fighter, Machen seemed headed for the championship until Sweden's Ingemar Johansson kayoed him in the first round of a 1958 fight.

• knock cold
• knock out
• kayo
• knocked out
• KO'd
• out
• stunned