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English definition of “billow”

billow

verb [I]    /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 .
(Definition of billow verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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