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v. Alternative form of empurple.

v. To color or tinge with purple; to make red or reddish; to purple.

See empurple.

"On the water, meanwhile, the last White Lilies are sinking beneath the surface, the last gay Pickerel-Weed is gone, though the rootless plants of the delicate Bladder-Wort, spreading over acres of shallows, still impurple the wide, smooth surface."

impurpled    impurpling   

purple