expression, ichidan verb
turn one's back on; turn away from
Physically turning one's back to someone or something, often implying rejection or disregard.
彼は何も言わずに背中を向けた。
He turned his back without saying anything.
喧嘩の後、彼女は私
After the argument, she sat with her back to me.
expression, ichidan verb
be uninterested in; ignore; shun
Figurative use: showing lack of interest or deliberately ignoring someone or something.
彼は政治に背中を向けて、自分の仕事だけに集中している。
He turns his back on politics and focuses only on his own work.