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背に

with one's back to

→ 背
phrase Rare #42,260
with one's back to Used to describe something positioned behind a person or someone facing away from something. Often followed by して, as in 背にして, meaning “with one’s back to.”
JA: 彼は海を背にして写真を撮った。
EN: He took a picture with his back to the sea.

太陽を背に

With the sun at your back

— ベルリン・天使の詩 (1987)

社長は窓を背にして椅子に座っていた。

The company president was sitting in a chair with his back to the window.