1 Originally a wooden dowel, but the meaning has been extended to describe the small brass bearing in the centre of the sheave of a block to keep it from splitting and to prevent wear by the pin on which it turns. Coaks, or dowels, used often to be fitted into the upper face of the wooden knees to engage in corresponding holes in the beams of ships to prevent them slipping.
2 As a verb, a spar is coaked when it has been broken and the two pieces joined together by making a hollow in one of the broken ends and a projection in the other end which fits it exactly.
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