0 past simple and past participle of billow --
1 to spread over a large area, or (especially of things made of cloth) to become filled with air and appear to be larger: --
The giant white clouds that billowed around the shuttle at each launch were not smoke, but water vapor generated as the rocket exhaust boiled away huge quantities of water.
But the monk disapproved of their use and threw them into the fire, from which an enticing aroma billowed and the monks came out to investigate.
Unfortunately the novel fuel system was not a success and billowed out large clouds of black smoke, leading to the abandonment of the idea for several years.
Rescuers pulled mangled bodies from damaged cars as smoke billowed into the sky.
These rigid balloons were held up over a fire so that the smoke billowed well into the cavity of the sphere.
Two simultaneous eruptions issued from the volcano; a cloud of ash and steam billowed seven miles into the sky.
She was bathed in light as smoke billowed at feet.
Smoke billowed hundreds of feet in the air and flames rose out of the clock tower.
