the circumference of the body at the waist: exercises to reduce the waistline.
the part of a garment that lies at or near the natural waistline, as the seam where the skirt and bodice of a dress are joined.
an imaginary line encircling the waist.

1895–1900; waist + line1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
waistline (ˈweɪstˌlaɪn)
1.  a line or indentation around the body at the narrowest part of the waist
2.  the intersection of the bodice and the skirt of a dress, etc, or the level of this: a low waistline

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
My waistline was growing faster than the stack of pages on my desk.
Gain an inch on your waistline and lose and inch from your wallet.
It's easy to forget that every link is a human relationship and every circle a
So, even if it threatens the waistline, a good marriage might actually help
  mend broken hearts.
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