1The back (of the body) — the rear part of the torso from the shoulders down to the waist, in people or animals. A basic, everyday body-part word.
重い荷物を持ちすぎて、背中が痛い。
I carried too much heavy luggage, and now my back hurts.
彼女は背中に大きなリュックを背負っていた。
She was carrying a large backpack on her back.
こちらに背中を向けたまま話さないでください。
Please don't keep your back turned toward us while you talk.
子どもを背中におんぶして歩いた。
I walked with the child carried on my back.