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jump seat

American  

noun

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

jump seat British  

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of jump seat

An Americanism dating back to 1860–65

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.