• 殉職じゅんしょく — to die in the line of duty
• 殉教じゅんきょう — martyrdom; to die for one’s faith
• 殉死じゅんし — to follow one’s master in death (historical)
• 殉葬じゅんそう — burial of attendants with the deceased; sacrificial burial (historical)

With the death radical 歹 on the left, 殉 suggests a life that ends while following someone or something — a cause, a duty, or a leader. It often appears in solemn words for those who lost their lives in service.