Definitions

1. noun

a large wave or a sudden increase in something, especially a quantity of something

“The stormy sea was filled with billow after billow of foam.”

2. verb

to swell or rise up in great waves or quantities

“The wind began to billow the sails, making the boat speed faster.”

3. verb

to flow or pour out freely and abundantly

“The crowd billowed out of the stadium as the concert ended.”

4. noun

a fold or a billowy part of a garment, especially a scarf or a cloak

“The model wrapped her billow of silk around her shoulders.”