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Pronunciation

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Singular
balloon

Plural
balloons

 
Many colorful toy balloons
  1. (countable) A balloon is a light round ball filled with air that floats; often a child's toy.
    My balloon floated away into the sky.
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Plain form
balloon

Third-person singular
balloons

Past tense
ballooned

Past participle
ballooned

Present participle
ballooning

  1. If something balloons, that means it grows very fast.
    The price of oil has ballooned.