Longman Dictionary of Contemporary English homepage

balloon

2 verb
     
balloon2 [intransitive] also balloon out
1 to suddenly become larger in amount [= explode]:
The company's debt has ballooned in the past year.
2 if someone balloons, they suddenly become fat:
Paul ballooned after he got married.
3 to get bigger and rounder:
The sheet flapped and ballooned in the wind.

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