ko

noun3

1. •
   A local shape to which the ko rule applies; a ko shape.

   • Black gets an easy game by just filling the ko.
2. •
   a stone in a ko in atari, a ko stone

   • Black recaptures the ko and white has to find another ko threat.
3. •
   ko fight

   • Black wins the ko easily.

verb2

1. •
   To knock someone out; to render someone unconscious.

   • Joe KO'd the opposing boxer.
2. •
   To start play.

noun2

1. •
   Abbreviation of knock out.
2. •
   Abbreviation of kick-off (“the time or manner of start of play”).