n. In metallurgy, the lining of the hearth forming the working-bed of the puddling-furnace.n. The repairing or preparation of a machine or part of a machine.n. The process of cleaning castings after they leave the foundry sand, including the chipping off of runners, fins, and scabs, filing rough spots, cleaning sand from the surfaces, and cleaning out cores.n. The repairing of the hearth of a puddling-furnace by the use of iron ore rich in oxygen.n. In ceramics, the process of evening the glaze on the surface of biscuit-ware before it is tired in the glost-kiln.