腰に

at the waist

→ 腰
phrase Rare #36,631
at the waist 腰 can refer to the waist or the lower back, depending on context. に marks the location.
JA: 腰に手を当てて、深呼吸した。
EN: I put my hands on my waist and took a deep breath.

腰に手をおいて。

Put your hands on your hips.

腰に強い痛みがあるんです。

I have severe pain in my lower back.

彼女は腰に革のベルトをしている。

She is wearing a leather belt around her waist.