1. [noun] (game of go) a local shape to which the ko rule applies, a ko shape
2. [noun] (game of go) ko fight
3. [noun] (game of go) a stone in a ko in atari, a ko stone
4. [noun] (boxing) A knock out.
5. [verb] (transitive) (boxing) To knock somebody out, to render somebody unconscious.
6. [noun] A blow that renders the opponent unconscious.
