Definition of KO abbreviation from the Oxford Advanced Learner's Dictionary

 

KO

 abbreviation
(also kayo)abbreviation
BrE BrE//ˌkeɪ ˈəʊ//
 
; NAmE NAmE//ˌkeɪ ˈoʊ//
 
 
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knockout Word Origin 1920s: abbreviation.
See the Oxford Advanced American Dictionary entry: KO

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