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English definition of “billow”

billow

verb [I]     /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.Spreading and scatteringBecoming biggerEnlarging and inflating billow     noun [C usually plural] billows of smokeClouds, dew, fog and steam
(Definition of billow verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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