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English definition of “billow”

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billow

verb [I] uk   /ˈbɪl.əʊ/ us    /-oʊ/
to spread over a large area, or (especially of things made of cloth) to become filled with air and appear to be larger: Smoke billowed (out) from the burning building. The sheets/shirts hanging on the line billowed in the breeze. We watched the boats with their billowing sails.
billow
noun [C usually plural] uk   us  
billows of smoke
(Definition of billow from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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