Is Ko A Word - A blow that renders the opponent unconscious. How to use ko in a sentence. The meaning of ko is knockout. Noun plural ko's or k.o.'s. Web verb ko's, ko'ing, ko'd, k.o.'s, k.o.'ing or k.o.'d. A slang term for knock out: 1 definition found from wordnet (r) 3.0 (2006) [wn]:
A blow that renders the opponent unconscious. The meaning of ko is knockout. 1 definition found from wordnet (r) 3.0 (2006) [wn]: A slang term for knock out: How to use ko in a sentence. Noun plural ko's or k.o.'s. Web verb ko's, ko'ing, ko'd, k.o.'s, k.o.'ing or k.o.'d.