airbag

or air bag

[ air-bag ]
/ ˈɛərˌbæg /

noun

a bag mounted in the interior of a motor vehicle, cushioning the seat occupant by inflating automatically in the event of collision.
a very large inflatable safety or cushioning device, as to protect a spacecraft during a landing.

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Origin of airbag

First recorded in 1965–70; air1 + bag
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for airbag

air bag

noun

a safety device in a car, consisting of a bag that inflates automatically in an accident and prevents the passengers from being thrown forwards
one of a number of large inflatable bags comprising part of a spacecraft's landing system, enabling the craft to come to rest through a series of bounces
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