Billow

What is Billow ?

Billow is (noun) 1. a very large wave 2. a mass of moving smoke We could see billows of smoke rising from the volcano. ((verb)) 1. to become full of air The sails of the yachts billowed in the breeze. 2. to move in large waves Smoke billowed out of the building.

 

source: Easier English, Student Dictionary Upper Intermediate Level