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plural beltlines
(automotive) The imaginary line marking the upper end of the lower body of an automobile, running just below the bottoms of the windows quotations examples
He also envisioned a car with a high beltline and exaggerated forms that visually suggested power, and at the same time promised solidity and security.
2007 May 27, Phil Patton, “From a Bad Marriage, Pretty Babies”, in New York Times
A beltway: a circular expressway around a city examples