1. coak - Noun
2. coak - Verb
See Coke, n.
A kind of tenon connecting the face of a scarfed timber with the face of another timber, or a dowel or pin of hard wood or iron uniting timbers.
A metallic bushing or strengthening piece in the center of a wooden block sheave.
To unite, as timbers, by means of tenons or dowels in the edges or faces.
Source: Webster's dictionary