In summer on nice days, I was allowed to ride in the car's rumble seat.
At the auto auction today there was a 1969 Mustang with a rumble seat which supposedly was a rare pseudo-factory option.
In one scene, Buster is forced to accept a ride from his rival, and he has to sit in the open rumble seat while Sally sits with the rival in the front.
Definition of rumble seat in US English:
rumble seat
nounˈrəmbəl ˌsēt
North American
An uncovered folding seat in the rear of an automobile.
〈北美〉（汽车后部的）折叠加座
Example sentencesExamples
In summer on nice days, I was allowed to ride in the car's rumble seat.
At the auto auction today there was a 1969 Mustang with a rumble seat which supposedly was a rare pseudo-factory option.
In one scene, Buster is forced to accept a ride from his rival, and he has to sit in the open rumble seat while Sally sits with the rival in the front.