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English definition of “billow”

billow

verb [I]  /ˈbɪl·oʊ/ us  
to spread over a large area, or (esp. of items made of cloth) to become filled with air and appear to be larger: The building is draped in blue plastic sheeting that flaps and billows like a sail.

billow

noun [C usually pl]  /ˈbɪl·oʊ/ us  
a large wave or any large, swelling mass: billows of smoke
(Definition of billow from the Cambridge Academic Content Dictionary © Cambridge University Press)
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