kayo['kei'əu]n.1.■[美国俚语]【拳击】击倒,击败vt.1.■把…击倒;把…打昏:to kayo someone with a stick用棍子将某人打昏2.■弄坏;降低…的效力3.■【棒球】“打掉”(投手)变形n.kayos