KO

or K.O., k.o., kay·o

[ noun key-oh, key-oh; verb key-oh ]

/ noun ˈkeɪˈoʊ, ˈkeɪˌoʊ; verb ˈkeɪˈoʊ /

Slang.

noun, plural KO's.

a knockout in boxing.

verb (used with object), KO'd, KO'ing.

to knock unconscious, especially in a boxing match; knock out.

Origin of KO

First recorded in 1920–25; initial letters of knock out

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ko

“There should be a statue of John Carlos in every city,” KO opined.
Keith Olbermann Makes Hilarious Return to ESPN, But for How Long?|Lloyd Grove|August 27, 2013|DAILY BEAST
Ko Young-hui died of breast cancer in exile in Paris in 2004.
North Korea IDs Mystery Woman as Kim Jong-Un’s Wife—But Who Is She, Really?|Nate Thayer|July 26, 2012|DAILY BEAST
Ko is portrayed speaking in the film over still images of her nurturing Kim Jong-un.
North Korea IDs Mystery Woman as Kim Jong-Un’s Wife—But Who Is She, Really?|Nate Thayer|July 26, 2012|DAILY BEAST
The leader of the four indicated Throon and said in a quick, brittle voice: "Ko reegar feen no-dran!"
Cry from a Far Planet|Tom Godwin

On the following day, which was the Sabbath, two services were held in Mr. Ko's mulberry grove.
The Red Miriok|Anna M. Barnes
The house stood in a grove of mulberries, for to his other pursuits Mr. Ko added that of silkworm raising.
The Red Miriok|Anna M. Barnes
Guanaco, gw-n′ko, n. a cameloid ruminant widely spread in South America.
Chambers's Twentieth Century Dictionary (part 2 of 4: E-M)|Various
Nowadays high-class women drop the "O" before their individual names, but add "Ko" after them.
Romances of Old Japan|Yei Theodora Ozaki

British Dictionary definitions for ko

k.o.

/ (ˈkeɪˈəʊ) /

verb KO's, KO'ing, KO'd, k.o.'s, k.o.'ing or k.o.'d

a slang term for knock outSee knockout

noun plural KO's or k.o.'s

a slang term for knockout

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012