"balloon" in the noun sense
large tough nonrigid bag filled with gas or heated air
small thin inflatable rubber bag with narrow neck
"balloon" in the verb sense
ride in a hot-air balloon
"He tried to balloon around the earth but storms forced him to land in China"
2. balloon, inflate, billow
"The sails ballooned"
Source: WordNet® (An amazing lexical database of English)
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