Definition of balloon noun from the Oxford Advanced Learner's Dictionary

     

    balloon

     noun
    noun
    BrE BrE//bəˈluːn//
     
    ; NAmE NAmE//bəˈluːn//
     
     
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  1. 1a small bag made of very thin rubber that becomes larger and rounder when you fill it with air or gas. Balloons are brightly coloured and used as decorations or toys. to blow up/burst/pop a balloon My balloon has burst! A thousand balloons were released to mark the event. compare trial balloon
  2. 2 (also hot-air balloon) a large balloon made of strong material that is filled with hot air or gas to make it rise in the air, usually carrying a basket for passengers
  3. Word Origin late 16th cent. (originally denoting a game played with a large inflated leather ball): from French ballon or Italian ballone ‘large ball’.Extra examples She crossed the Atlantic in a hot-air balloon. They tied the balloons to the back of the car. We went up in a balloon. helium balloons for the children’s partyIdioms
    go down like a lead balloon
     
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    (informal) to be very unsuccessful; to not be accepted by people My suggestion went down like a lead balloon.
    when the balloon goes up
     
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    (British English, informal) when the trouble that you are expecting begins We have to get out of here before the balloon goes up!
See the Oxford Advanced American Dictionary entry: balloon