American Dictionary

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Definition ballooning in American English

ballooning noun

[uncountable] noun
/bəˈlunɪŋ/
1

the activity of flying in a hot-air balloon

Synonyms and related words
2

when spiders move to a new area by sending out silk threads allowing them to be carried on air currents

Example

It's unclear what spurs these spiders take to the skies in what are called mass ballooning events.

Definition ballooning in American English