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
Words nearby jump seat
jump line,
jump on,
jump out of one's skin,
jump pass,
jump rope,
jump seat,
jump shooter,
jump shot,
jump spark,
jump suit,
jump the gun
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