Coak.
1. (Carpen- try.) a. A projection from the general face of a scarfed timber, of the nature of a tenon, and occupying a recess or mortise in the counterpart face of the other timber. A tabling. The mortise is sometimes known as a sunk-coak. b. A joggle or dowel by which pieces are united to prevent slipping past each other, or to fasten them together. See dowel. 2. A square bushing in the sheave of a block, which forms a socket for the pin. See block.
