jump-seat

jump seat

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

Origin:
1860–65, Americanism

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World English Dictionary
jump seat
 
n
1.  a folding seat for temporary use, as on the flight deck of some aircraft for an additional crew member
2.  (Brit) a folding seat in a motor vehicle such as in a London taxi

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