billow
verb [ I ] uk/ˈbɪl.əʊ/ us/ˈbɪl.oʊ/
波浪般起伏，汹涌向前;（尤指布制品因充气）鼓起
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. 滚滚浓烟不断从着火的大楼里涌出。
The sheets/shirts hanging on the line billowed in the breeze. 挂在绳子上的床单／衬衫在微风中飘动。
We watched the boats with their billowing sails. 我们看着那些小船鼓起风帆。