waistline

IPA: wˈeɪstɫaɪn

a line around the body at the waist; its measurement
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
(slang) person having a large waistline
(automotive) The horizontal line just below the windows of a car or other vehicle.

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