air bag

air bag

noun
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:
1830–40, for an earlier sense

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World English Dictionary
air bag
 
n
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

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