a. & n. from Slock. [ 1913 Webster ]
Slocking stone, a rich piece of ore displayed in order to tempt persons to embark in a mining enterprise. [ 1913 Webster ]
n. 1. The act of obstructing, supporting, shaping, or stamping with a block or blocks. [ 1913 Webster ]
2. Blocks used to support (a building, etc.) temporarily. [ 1913 Webster ]
(Arch.) The finishing course of a wall showing above a cornice. [ 1913 Webster ]