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air bag

noun
1.
an inflatable plastic bag mounted under the dashboard or on the back of the front seat of a car: it cushions the driver and passengers by inflating automatically in the event of collision.
Origin
1830-1840
1830-40, for an earlier sense
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for air-bag

air bag

noun
1.
a safety device in a car, consisting of a bag that inflates automatically in an accident and prevents the passengers from being thrown forwards
2.
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
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