“击杀”的意思是把敌人打死或杀死，多用在打仗、打猎或者电子游戏里。

The meaning of "击杀" is to kill or slay an enemy, often used in warfare, hunting, or video games.

这个词比较正式，玩游戏的人也常常用它来说打败对手。

This word is quite formal, and gamers also often use it to mean defeating an opponent.