A rumble seat (American English), dicky seat, dickie seat or dickey seat (British English), also called mother-in-law seat, is an upholstered exterior seat which folds into the rear deck of a two-seat pre-World War II automobile, and seats one or two passengers. When unoccupied, the space under the seat's lid could be used for storing luggage. Roadster, coupe and cabriolet auto body styles were offered with either a luggage compartment or a rumble seat in the deck. Models equipped with a rumble seat were often referred to as a sport coupe or sport roadster.