1.NounA 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.
"a drawbore pin"
2.VerbTo make a drawbore in.
"to drawbore a tenon"
3.VerbTo enlarge the bore of a gun barrel by drawing, instead of thrusting, a revolving tool through it.