KO (kā'ō') tr.v.
KO'd, KO'ing, KO's To knock out, as in boxing. n.
(kā-ō', kā'ō') A knockout, as in boxing.
Kos also Cos (kŏs, kôs) An island of southeast Greece in the northern Dodecanese Islands at the entrance to the Gulf of Kos, an inlet of the Aegean Sea on the southwest coast of Turkey. Hippocrates founded a medical school on the island in the fifth century B.C. Kos became part of modern Greece in 1947.
n. a knockout. (The abbreviation is an initialism. Boxing.) : It was a quick KO, and Wilbur was the new champ.
tv. to knock someone out. (See also KOed. Boxing.) : Wilbur planned to KO Wallace in the third round.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
kos
measure of distance in India (about 2 miles), from Hindi kos, from Skt. krosah, lit. "a call, a shout;" thus, "distance within which a man's shout can be heard."