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A gasbag is someone who talks too much, especially with a lot of empty air — opinions, stories, promises — and not much substance. The picture is a bag stuffed with gas, hot air instead of anything solid. It is informal and not polite: you might say it about a boring speech-maker among friends; you would not put it in a thank-you letter. Though actually there is also a technical sense, the bag that holds gas in a balloon or , but this everyday use is the , and that is the one people mean when they roll their eyes.
話癆、愛講空話的人（不禮貌；不是在說氣球）
組成From gas + bag. The picture is a bag stuffed with gas — hot air — instead of anything solid.
同家族的字
- windbagthe same joke with wind instead of gas: a person full of empty talk
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
gasbagnoun/ˈɡæs.bæɡ/
- 1
A bag or bladder to hold a reservoir of gas, as in a hot-air balloon.
- In half an hour a good-sized gas-bag had been formed, and the jerking and straining upon the thongs showed that it was capable of considerable lift.
- By this method of construction a considerable amount of support can be imparted to the gasbag, though it does not dispense with the services of the ballonet, as does the entirely rigid type.
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A lighter-than-air aircraft; a balloon or dirigible.
- 3
derogatoryA person who is overly garrulous or prone to making empty, unsupportable statements; a windbag.
- Not that the Reverend James is absolutely a pretentious gasbag any more than Marchbanks is an inspired prophet. He has a definite, a positive part in the world's work.
- You would think the fate of civilization itself rested on the outcome of my trial, based on some of those gasbags who were only too happy to speculate, postulate and pontificate about my situation.
gasbagverb/ˈɡæs.bæɡ/
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informalTo speak foolishly, pompously, or at length; to blather.
- "You're a swell at it. I'll allow that. And I'll provide the gas-bagging." / "The gas-bagging?" I inquired. "What exactly do you mean?" / "What do I mean, you dear old sober-sides?" said Lyne. “I mean that I will do all the bow-wowing[…]"
- You all see her flirtin and makin up to people and then they gasbag about it to make themselves important. But that's just her way. Underneath she's one of the most shy people you'd ever meet.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。