tumblehome
n.— «We all tried to out-fin each other back in the Fifties, and we let the fat look get out of hand in the Sixties and early Seventies, when the industry got so carried away with turn-under and tumblehome that some of the cars started looking like horseshoe crabs on roller skates.» —by Bill Mitchell Corvette: A Piece of the Action—Impressions of the Marque and the Mystique, 1953-1985 , 1984. (source: Double-Tongued Dictionary)