Found in the following dictionaries
SOWPODS (Collins Scrabble Words)
"Ko" Definition
noun
A local shape to which the ko rule applies, a ko shape.
Source: Wiktionary
A stone in a ko in atari, a ko stone.
Source: Wiktionary
Ko fight.
Source: Wiktionary
A knockout in a boxing match.
Source: Oxford Dictionary
verb
To knock out (as in boxing).
Source: Merriam-Webster
Knock (an opponent) out in a boxing match.
Source: Oxford Dictionary
residual
Kick-off.
Source: Oxford Dictionary
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