腰|こしkoshi[0]heiban (flat)

1. nounlower back; waist; hips; lumbar region
   腰こしに持病じびょうがあります。↗

   I have back problems.
2. nounbody (of hair, noodles, paper, etc.); resilience; springusu. コシ

• SynonymウエストNeutralLoanword for the waist or waistline, mostly in clothing sizes, as in 「ウエストが細い」; 「腰」 also covers the lower back and the resilience of things.
• Synonym腰部ようぶWrittenMedical and written term for the lumbar region, as in 「腰部の痛み」; everyday speech just uses 「腰」.
• RelatedヒップNeutralLoanword for the buttocks or hip measurement, often in clothing sizes; a different body part from 「腰」.
• RelatedウエストラインNeutralLoanword for the waistline or the waist line of a garment; confined to descriptions of clothing and body shape.
• Related胴回りどうまわりNeutralThe girth around the torso, i.e. the waist measurement; leans toward the figure rather than the body part itself.
• Related臀部でんぶWrittenWritten, medical term for the buttocks, which sit below 「腰」; in everyday speech say 「お尻」.

Use 「腰」 for the body's waist and lower back and for the resilience of noodles or paper. For waist measurement in clothing say 「ウエスト」; for the buttocks say 「ヒップ」 or 「お尻」; in medical contexts use 「腰部」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. （こし） ヒトの身体からだの背部はいぶにあって、臀部でんぶの上部じょうぶ、せなかの下部かぶである部位ぶい。