v. Carpentry. [Variant of CIPHER v. 9.] To make a lap-joint by overlapping two bevelled or chamfered plank-edges, so as to leave a plane surface. So Sypher-joint.
1841. Dana, Seaman’s Man., Syphering, lapping the edges of planks over each other for a bulk-head.
1875. Knight, Dict. Mech., Sypher-joint. (Carpentry.) A lap joint for the edges of boards, leaving a flat or flush surface.
