Definition of balloon noun from the Oxford Advanced American Dictionary

     

    balloon

     noun
    noun
    NAmE//bəˈlun//
     
     
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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 colored and used as decorations or toys to blow up/pop a balloon My balloon has burst! A thousand balloons were released to mark the event. compare trial balloon
  2. 2 = hot-air balloon
  3. Idioms
    go over like a lead balloon(informal)
     
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    to be very unsuccessful; to not be accepted by people My suggestion went over like a lead balloon.
See the Oxford Advanced Learner's Dictionary entry: balloon