The whole body; entirety of the body (from head to toe). Also used for full-length portraits or whole-body images.
全身を鏡でチェックしてから出かけた。
I checked my whole body in the mirror before going out.
全身写真を撮ってオーディションに提出した。
I took a full-body photo and submitted it to the audition.
スキーで全身を使ってバランスをとる必要がある。
You need to use your whole body to keep balance when skiing.
Relating to the entire body; systemic (often used in medical contexts, similar to 'systemic').
全身に発疹が出たので医者に診てもらった。
I had a rash all over my body, so I saw a doctor.
全身麻酔で手術を受ける予定だ。
I am scheduled to have surgery under general (full-body) anesthesia.
その病気は全身に影響を及ぼす可能性がある。
That illness can potentially affect the entire body.