n. In mining, the lining of the bottom of a sluice, made of blocks or slats of wood, or stones, arranged in such a manner that chinks are left open between them.n. A piece of plank placed transversely in, and fastened to the bottom of, a fish-ladder.n. In seal-engraving, a very small iron disk at the end of a tool, used to develop a high polish.n. A ripple, as upon the surface of water; hence, a rapid; a place in a stream where a swift current, striking upon rocks, produces a boiling motion in the water.To shuffle a pack of cards by butting the two parts of the pack into each other and then bending them so that they slip together.