billow
Definitions
A large sea wave or a similar mass of something, typically smoke or fabric, that rises and rolls.
To fill with air and swell outward, as a sail or piece of fabric.
To move or flow outward in a surging, undulating mass.
Examples
The white curtains began to billow in the gentle evening breeze.
Thick clouds of smoke started to billow from the chimney of the old cottage.