Definition of balloon verb from the Oxford Advanced American Dictionary



    Verb Forms present simple I / you / we / they balloon
    he / she / it balloons
    past simple ballooned
    -ing form ballooning
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  1. 1[intransitive] balloon (out/up) to suddenly swell out or get bigger Her skirt ballooned out in the wind. Unemployment ballooned to fourteen percent.
  2. 2[intransitive] go ballooning to travel in a hot-air balloon as a sport
See the Oxford Advanced Learner's Dictionary entry: balloon