rumble seat

noun

1. British, dickey. a seat recessed into the back of a coupe or roadster, covered by a hinged lid that opens to form the back of the seat when in use.

2. Furniture.,  wagon seat.

3. Slang.,  the buttocks.

rumble seat

noun

1. a folding outside seat at the rear of some early cars; dicky

Word History and Origins

Origin of rumble seat¹

First recorded in 1910–15