kayo noun 1verb 1forms 5 noun1 •A knockout.His stunning title-winning kayo of Charles captivated the country, and on top of everything, he was actually an amazing fighter for one of his years, both as a puncher and boxer. — 2023 verb1 •To knock someone out, or render them unconscious or senseless.When Lee Savold, a perennial heavyweight title contender, was kayoed by the great Joe Louis, he was asked by reporters, did anyone in his lengthy career hit harder than Joe? — 2014 formskayoed · kayoeing · kayoing · kayoes · kayos