jump seat

noun

1. a movable or folding seat, as in a carriage, taxicab, or limousine, used as an extra seat.

jump seat

noun

1. a folding seat for temporary use, as on the flight deck of some aircraft for an additional crew member

2. a folding seat in a motor vehicle such as in a London taxi

Word History and Origins

Origin of jump seat¹

An Americanism dating back to 1860–65