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Definition of billow verb from the Oxford Advanced American Dictionary

billow

verb
/ˈbɪloʊ/ billow pronunciation American
 
1 [intransitive] (of a sail, skirt, etc.) to fill with air and swell outThe curtains billowed in the breeze.2 [intransitive] if smoke, cloud, etc.billows, it rises and moves in a large massA huge cloud of smoke billowed out of the chimney.