As a noun:
* The billows of the ocean crashed against the shore.
* The smoke from the fire rose in billows.
* The dancer's skirt flowed in billows as she twirled.
As a verb:
* The wind caused the flag to billow in the breeze.
* The curtains billowed in the draft.
* The smoke billowed out of the chimney.
Figurative language:
* Her hair billowed around her like a cloud.
* The anger billowed inside him.
* The music billowed out of the speakers.
It's important to note that "billow" can also be used as a synonym for "wave" when referring to the ocean.