To cover with a crust; form a crust or coating on the surface of; coat; overlay: as, an ancient coin incrusted with rust.In decorative art, to cover with a different and generally more precious material in plates or pieces of appreciable thickness, requiring to be held in place by cramps, hooks, cement, or other appliances.To apply or inlay, as mosaic, slabs of precious marbles, enameled tiles, or the like, so as to form a decoration or covering.