1
general::
Phrase(s): billow out
1. [for something, such as smoke] to burst and flow outward. • At the site of the fire, smoke billowed out. • Clouds of ash billowed out of the volcano. 2. [for a sheet of cloth] to fill with the wind. (Especially a ship’s sail.) • The sail billowed out and we moved forward. • Her skirt billowed out when the wind caught it.
McGrawhill's American Idioms And Phrasal Verbs