Drawbore

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Drawbore

(n.) A hole bored through a tenon nearer to the shoulder than the holes through the cheeks are to the edge or abutment against which the shoulder is to rest, so that a pin or bolt, when driven into it, will draw these parts together.
(v. t.) To make a drawbore in; as, to drawbore a tenon.
(v. t.) To enlarge the bore of a gun barrel by drawing, instead of thrusting, a revolving tool through it.