"ballooning" in the noun sense
1. ballooning
flying in a balloon
"ballooning" in the verb sense
1. balloon
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
become inflated
"The sails ballooned"
Source: WordNet® (An amazing lexical database of English)
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