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1. To flare out in the wind, as of fabric. The sails billowed out as the wind caught them.
2. To gush out of a place or thing, as of smoke. By the time I remembered I had put bread in the oven, smoke was billowing out of the kitchen.
1. [for something, such as smoke] to burst and flow outward. At the site of the fire, smoke billowed out. Clouds of ash billowed out of the volcano.
2. [for a sheet of cloth] to fill with the wind. (Especially a ship's sail.) The sail billowed out and we moved forward. Her skirt billowed out when the wind caught it.
1. To surge outward or puff out due to the movement of air: The sails billowed out as the breeze strengthened.
2. To cause something to stretch or puff out: The wind billowed the sails out. The breeze billowed out the sheets that were hung up on the clothesline.