1. a large wave or surge of water
2. a large mass of something that swells or rolls like a wave

1. to swell out or bulge like a wave
2. to move in large waves or surges

Examples

• The ship rode over the billows during the storm.
• Billows of smoke rose from the burning building.
• The curtains billowed in the strong wind.
• Steam billowed from the hot springs.
• White clouds billowed across the blue sky.
• Her dress billowed out as she spun around.
• The flag billowed proudly in the breeze.