jump seat


noun

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

Origin of jump seat

An Americanism dating back to 1860–65

British Dictionary definitions for jump seat

jump seat

noun

a folding seat for temporary use, as on the flight deck of some aircraft for an additional crew member
British a folding seat in a motor vehicle such as in a London taxi