To flare out in the wind, as of fabric. The sails bellied out in the afternoon breeze.Move the fan over there—let's see if we can get the model's skirt to belly out in this shot.The wind must be pretty strong now, Mom, because your sheets are bellying out on the clothesline.
[for a sheet of fabric, such as a ship's sail] to fill out in the wind. The sails bellied out as the ship turned to catch the wind.When the sails bellied out, we began to move forward.
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