1. swelling out or bulging in waves, especially when filled with air or wind

1. present participle of billow; swelling out in waves or surging forward

Examples

• The billowing curtains danced in the breeze.
• Smoke was billowing from the chimney.
• Her billowing dress caught everyone’s attention.
• The sails were billowing in the strong wind.
• Billowing clouds gathered before the storm.
• Steam came billowing out of the kettle.
• The flag was billowing proudly in the wind.