n. The operation of working over the faces of rough or worn grindstones with a hack-hammer; also, a similar treatment of the faces of polishing-wheels with a sharp tool of a like kind.n. In masonry, the separation of a course of stones into two smaller courses, when there are not enough large stones to form a single course.n. In gem-cutting, the cuts and grooves made in the metal laps by holding the cutting edge of a steel blade against them while in motion, for the purpose of providing receptacles or pockets for the powders used in cutting and polishing gems.Short and interrupted: as, a hacking cough. Also hacky.n. In brick-making, piling bricks for drying.n. In pathology, the emission of a succession of short coughs.n. In massage, the act of striking the muscles with the side of the hand.