a hole in a tenon made eccentric with the corresponding holes to the mortise so that the two pieces being joined will be forced tightly together when the pin (drawbore pin) is hammered into place.
verb (used with object), draw·bored, draw·bor·ing.
to make a drawbore in (a tenon).
Origin of drawbore
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019