Asweep

the line that goes wavingly asweep round the base of the holy mountain, separating it from the common earth.

Source: wiktionary

Where fierce hot winds have set the pine and myall boughs asweep

Source: wiktionary

When winds are asweep through the Pecos Valley, they whimper and moan in the barbed-wire fence like troubled ghosts.

Source: wiktionary

I thought of Mr. O’Neill, who was tall, pale and melancholy, with long white hair asweep, very like the picture of composers of my music book-covers.

Source: wiktionary