Killer instinct, in human behavior, is a reference to the human propensity to kill, murder. It may also refer to killing an opponent in a less literal sense.

This instinct can either be a natural inclination, or a programmed response. In the case of inclination, one feels the inner need or desire to harm or kill another for no apparent reason (otherwise perfectly calm and lucid).

See also

• Killer Instinct, a video game.

Murder | Sociology