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背を

one’s back

→ 背
phrase Rare #42,547
one’s back 背 refers here to the back of the body; を marks it as the object of an action.
JA: 彼は背を壁に向けて立っていた。
EN: He stood with his back to the wall.

彼は背を壁に向けて立っていた。

He was standing with his back to the wall.

背を蹴ってほしいか

Do you want me to kick you in the back?

— コーラス (2004)