This is the 9990th most frequent Japanese word.
身柄
"身柄" means "physical custody" or "one's person."
身柄 refers to physical custody or detention of a person.
警察は彼の身柄を拘束しました。
The police detained him.
身柄 is used to denote the person being transferred or transported under custody.
彼の身柄の移送には厳重な警備が必要です。
Strict security is required for his transfer.
身柄 in this context refers to the individual's physical presence under custody and their release.