Waist
01
腰, ウエスト
the part of the body between the ribs and hips, which is usually narrower than the parts mentioned
例
He suffered from lower back pain due to poor posture and a lack of strength in his waist muscles.
彼は姿勢が悪く、腰の筋肉の力が不足していたため、腰痛に悩まされていました。
02
胴, くびれ
the curved middle part of the instrument that forms an hourglass shape, enabling a comfortable grip and playability
03
甲, アーチ
the narrow part of the shoe connecting the heel and the wide part of the sole
