• 殺人さつじん — homicide / murder
• 殺害さつがい — killing / murder
• 殺気さっき — bloodlust / hostility
• 殺到さっとう — rush / flood in
• 殺虫剤さっちゅうざい — insecticide
• 必殺ひっさつ — deadly / sure kill

The character combines 殳 (weapon / action radical) with phonetic elements to convey violent action. Its meaning is explicit and strong — often associated with legal terms or dramatic expression.

犯人はんにんは 殺人さつじんの 罪つみで 逮捕たいほされた。
The suspect was arrested for the crime of murder.

虫むしを 殺ころすために 殺虫剤さっちゅうざいを 使つかいました。
I used insecticide to kill the bugs.