• WordNet 3.6
    • n gasbag the bag containing the gas in a balloon
    • n gasbag a boring person who talks a great deal about uninteresting topics
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Century Dictionary and Cyclopedia
    • n gasbag A bag for holding gas, as for the use of dentists or for a limelight.
    • n gasbag A cylindrical bag of some gas-tight material fitted with a tube and valve so that it can be filled with air from an air-pump. It is used to close a gas-main during repairs, by inserting it in the pipe when empty, and then blowing it up till it fills the pipe completely, and serves as a check or stop for the gas.
    • n gasbag A boastful, loquacious person; a conceited gabbler.
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In literature:

In rigid airships ballonets are not provided for the gasbags, and as a consequence a long flight results in a considerable expenditure of gas.
"British Airships, Past, Present, and Future" by George Whale
Let the German cling to his gasbags.
"Mr. Britling Sees It Through" by H. G. Wells
The gasbags should be about half filled.
"The Mother and Her Child" by William S. Sadler
It was Maynard's fault; he was conceited, and a gasbag, and talked about the wrong things.
"Non-combatants and Others" by Rose Macaulay

In news:

Indeed, his long-running gig as the spokesman for Priceline is largely predicated on the idea he's kind of an old gasbag.
Right-wing gasbag slams MT fellow.
With 95 percent of gasbags reporting, an unofficial tally shows that there are 7,936,682 lessons that we must learn from Mitt Romney's defeat.