の背後に

behind

→ の
phrase Rare #38,830
behind Used to indicate a position behind someone or something. It can also refer figuratively to a hidden person or force supporting or controlling something.
JA: 彼女の背後に誰かが立っている。
EN: Someone is standing behind her.

勤務中警官は一人のお年寄り自分の背後に近づいてくるのを感じた

The police officer on duty felt an elderly person approaching from behind.

われわれはカーテンの背後に秘密のドアを見つけた

We found a secret door behind the curtain.

でけえ黒人貴様の背後に回るんだ

A huge Black guy is getting behind you.

— フォーリング・ダウン (1993)