The word 'billow' functions as both a verb and a noun.
Examples:
We watched the clouds billow in the breeze. (verb)
A billow of smoke from the campfire enveloped the campers. (noun)
He watched the cumulus clouds billow as the winds blew them over the mountaintop. (verb) A huge billow of smog engulfed the valley below the factory. (noun)
I saw a huge billow down by the beach yesterday!
Her cape billowed around her ankles as she strode into the sunset.
The word 'billow' is both a noun (billow, billows) and a verb (billow, billows, billowing, billowed).The noun billow is a singular, common, concrete noun; a word for a large undulating mass, such as a cloud, smoke, or steam; a rolling mass like a high wave; a word for a thing.The verb to billow is to to fill with air and swell outward; to rise or roll in waves.
Wave , swell , surge ,
cave in, depress, decline, recede
I think you mean billowing.The sheets are billowing in the wind.The smoke is billowing from the chimney.
She has a retentive memory, able to remember even the smallest details of past events.
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