Definition from Wiktionary, the free dictionary
beltline (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
2007 May 27, Phil Patton, “From a Bad Marriage, Pretty Babies”, in New York Times:
- 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.
- A beltway: a circular expressway around a city