English

Noun

rumble seat ‎(plural rumble seats)

1. (dated) An extra passenger seat or row of seats in an automobile, which typically folds away into a rear storage compartment.
   • 1934, Rex Stout, Fer-de-Lance, 1992 Bantam edition, ISBN 0553278193, pages 166–167:

     I suspected I wouldn't care an awful lot for his companionship, so I put him and another one in the rumble seat, and with the other two in with me I found the trail back to the Parkway and turned south.

2. (aviation, colloquial) A jump seat.