jump seat

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

Origin:
1860–65, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The first lady rode in a jump seat in the back of the vehicle.
The plane was totally full but perhaps she should have located a jump seat.
Delivery trucks with seating only for the driver or only for the driver plus a
  folding jump seat.
Although newer apparatus are designed with fully enclosed cabs, older apparatus
  with jump seat riding areas are still in service.
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