Meaning of “billow” in the English Dictionary

"billow" in British English

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billowverb [ I ]

uk /ˈbɪl.əʊ/ us /ˈbɪl.oʊ/

(Definition of “billow” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"billow" in American English

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billowverb [ I ]

us /ˈbɪl·oʊ/

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.

billownoun [ C usually pl ]

us /ˈbɪl·oʊ/

a large wave or any large, swelling mass:

billows of smoke

(Definition of “billow” from the Cambridge Academic Content Dictionary © Cambridge University Press)