What is the definition for billow?

"Billow" can have two main meanings, depending on the context:

1. (Noun): A large wave, especially on the sea.

*Example:* "The ship tossed about on the billows of the stormy sea."

2. (Verb): To swell out in a large curve, like a wave.

*Example:* "The curtains billowed in the breeze."

In both cases, the word "billow" evokes a sense of size, movement, and fullness.