The empirical principle that most systems will work best if they are kept simple rather than made complex.

(colloquial) One who flatters a supervisor, or superior, in order to get special attention

(Britain, euphemistic, humorous) A sharp, sudden headbutt to the nose, usually resulting in a broken nose.

(games) A children's game similar to tag, the object being for the person who is "it" to catch and kiss another of the participants, who then subsequently becomes "it".

Acronym of keep it simple, stupid.

The KISS principle.

Fate; a predetermined or unavoidable destiny.

A kiss on the cheek that signifies the death of the receiver, as delivered by a mob boss or one with such influence.

(idiomatic, UK) Mouth-to-mouth resuscitation.

One who kisses. / (slang) Mouth. / (slang) Face. / The kissing gourami.