(dead) body; corpse
「身」 has another reading with different meanings.
one's body; one's person
彼女は身を守るために武道を習い始めた。
She started learning martial arts to protect herself.
寒いので暖かい服を身につけている。
I'm wearing warm clothes because it's cold.
身の安全を第一に考えて行動しましょう。
Let's act with our safety as the top priority.