Hack′ing.
1. (Masonry.) The division of a portion of a course of stones into two of smaller hight when the larger stones do not hold out. 2. A process employed in dressing the faces of rough grindstones by the use of a hack-hammer, an implement resembling an adze. In some cases the faces of metallic or wooden polishing-wheels are similarly treated, a sharper implement being used. 3. Piling of molded bricks to dry. See hack.