balloon - definition and synonyms

verb [intransitive] 

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present tense
present participleballooning
past tenseballooned
past participleballooned
  1. 1
    to become larger and rounder in shape

    Her coat ballooned round her in the wind.

     Synonyms and related words
  2. 2
    to increase very quickly in amount or degree

    Within weeks, the fighting had ballooned into full-scale war.