Longman Dictionary of Contemporary English homepage

billow

1 verb
     
bil‧low1 [intransitive]
1 also billow out if something made of cloth billows, it moves in the wind:
Her long skirt billowed in the breeze.
2 if a cloud or smoke billows, it rises in a round mass
billow out of/up etc
There was smoke billowing out of the windows.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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