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English definition of “balloon”

balloon

noun [C] uk   /bəˈluːn/ us  
A2 a small, very thin rubber bag that you blow air into or fill with a light gas until it is round in shape, used for decoration at parties or as a children's toy: We tied balloons and streamers to the ceiling ready for the party. (also hot-air balloon) a very large balloon that is filled with hot air or gas and can carry people in a basket (= open container ) hanging under it: People first flew in a balloon in 1783. a speech bubble

balloon

verb [I] uk   /bəˈluːn/ us  
to get bigger and rounder: I ballooned when I was pregnant with my second baby. to quickly increase in size, weight, or importance: The rumours soon ballooned into a full-blown scandal.
(Definition of balloon from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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