1. Large tough nonrigid bag filled with gas or heated air 
2. Small thin inflatable rubber bag with narrow neck

1. Ride in a hot-air balloon
   "He tried to balloon around the earth but storms forced him to land in China" 
2. Become inflated
   "The sails ballooned"
   - inflate, billow

Derived forms: balloons, ballooned, ballooning

See also: balloonist

Type of: aviate, expand, fly, lighter-than-air craft, pilot, plaything, toy

Encyclopedia: Balloon

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