breakwind

He bent and disappeared out of the sheltering circle of the fir-fronds, returning in a moment with an armful of boughs. He went back, foraging, and she heard him snapping off others. Presently he was beside her again, and began to construct the break-wind, interweaving from the ground up to the fir-fronds a wall of boughs. Abruptly the wind ceased to blow upon Clair's back.