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rumble seat

1 ENTRIES FOUND:
rumble seat noun
plural rumble seats
rumble seat
noun
plural rumble seats
Britannica Dictionary definition of RUMBLE SEAT
[count] US, old-fashioned
: a seat in the back of a car that folds down and is not covered by the top
◊ Rumble seats were most common in cars made during the 1920s and 1930s.