A rumble seat, dicky seat, dickie seat or dickey seat is an upholstered exterior seat which hinges or otherwise opens out from the rear deck of a pre-World War II automobile, and seats one or more passengers. In a carriage, a rumble (short for "rumble-tumble") was a seat behind the body used by servants.
Prior to World War I, a single, center-mounted rumble seat was sometimes referred to as a mother-in-law seat.
