Look up waistline in Wiktionary, the free dictionary.

Waistline refers to:

• the waist on a human body — the narrow point of the abdomen between the ribcage and hips

or

• Waistline (clothing) — the line of demarcation between the upper and lower portions of a garment, which notionally corresponds to the natural waist but may vary with fashion from just below the bust to the upper hips

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