waistline

From waist +‎ line.

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waistline (plural waistlines)

1. a line around the body at the waist; its measurement
2. the narrowest part of a garment, usually at the waist, but may be above or below depending on the dictates of fashion or the whim of the designer
3. (slang) person having a large waistline
4. (automotive) The horizontal line just below the windows of a car or other vehicle.
   • 1979 August, Graham Burtenshaw, Michael S. Welch, “O.V.S. Bulleid's SR loco-hauled coaches - 1”, in Railway World, page 396:

     [...] with the adoption of a curved bodyside profile Bulleid considerably raised the height of the waistline and at the shoulder height of seated passengers, just where the extra space was most needed.

• (a line around the body at the waist): (informal) girth

• empire waist

• bustline