KOS

noun6

1. •
   Initialism of knowledge organization system.
2. •
   Acronym of Knackered Old Shit.
3. •
   Acronym of key operated switch.
4. •
   Initialism of kernel operating system.
5. •
   Initialism of knowledge organization structure.
6. •
   Acronym of key-operated selector.

phrase1

1. •
   Initialism of keep on smiling.

verb1

1. •
   Initialism of kill on sight: used in addition to a target player's username to alert teammates of a suspicious player that should be killed when seen.

noun1

1. •
   An island of the Dodecanese, Greece.