from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A bag that is recessed in an automobile interior and is inflated upon impact in a crash to prevent injury to a passenger.
  • noun An inflatable bag used for lifting heavy objects, especially one made of strong rubber used to lift vehicle or debris, as in an emergency.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A protective system in automobiles in which when a crash occurs, a bag containing nitrogen, formed by the explosive decomposition of sodium azide, quickly inflates in front of the driver or passenger, preventing injury to the head. Side air bags, including the back seat passengers, also prevent injury.
  • noun slang A person who talks too much; a windbag or gossip.


from Wiktionary, Creative Commons Attribution/Share-Alike License

From air +‎ bag.


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