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English definition of “balloon”

balloon

noun [C]  /bəˈlun/ us  
a small, thin, rubber bag that you can fill with air or another gas until it is round in shape, often used for decoration at parties or as a child’s toy A balloon is also a very large, round container filled with a gas that can rise in the air and carry people riding under it in an attached box.

balloon

verb [I]  /bəˈlun/ us  
to become larger, esp. quickly: The rumors soon ballooned into (= quickly became) a full-grown scandal.
(Definition of balloon from the Cambridge Academic Content Dictionary © Cambridge University Press)
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