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posture; position; pose; attitude
「腰」 has another reading with different meanings.
ベルトを腰に巻いてズボンを支えている。
I wear a belt around my waist to support my pants.
腰のサイズを測ってもらえますか。
Could I get you to measure my waist size?
腰に手を当てて深呼吸をしてリラックスした。
I put my hands on my waist and took deep breaths to relax.