air bag

a bag of nylon, plastic, etc. in a passenger restraint system that inflates instantly within an automobile at the impact of a collision, to protect riders from being thrown forward
often written airbag

See air bag in American Heritage Dictionary 4

noun
  1. An automotive passive restraint consisting of a bag that is designed to inflate upon collision and prevent passengers from pitching forward.
  2. A large inflatable bag made of strong rubber, used by rescue workers to lift a vehicle or heavy machinery or debris that has fallen upon or otherwise trapped a victim.

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