coak

Etymology 1
. The 1933 Oxford English Dictionary suggests a possible relation to an Old French cognate of 🇨🇬, to or to,  "drive oakum between planks", "all referring to the fitting of a projection into a notch, indentation, or hollow".

Noun

 * 1) A wooden dowel.
 * 2)  The brass bearing in the sheave of a block.

Verb

 * 1) To unite (timbers etc.) by means of tenons or dowels in the edges or face.