balloon2 (
also balloon out)
verb [intransitive]1. to suddenly become larger in amount
Synonym : 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. [TahlilGaran] Dictionary of Contemporary English ▲