billow
🇺🇸
/ˈbɪləʊ/
🇬🇧
/ˈbɪləʊ/
to swell out like a wave or cloud
The sails billowed as the wind picked up.
to rise and move in large masses like smoke or steam
Thick smoke billowed from the fire.
a large, wave-like mass of smoke, steam, etc.
The fire produced great billows of smoke.