Air bag

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.
Historical Examples

Further, by compressing the air inside the air bag, the rate of ascent or descent could be regulated.
A History of Aeronautics E. Charles Vivian

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


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