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Table of Contents -- counterbore POS
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counterbore

Noun, Verb (transitive)

coun=ter=bore

WORDNET DICTIONARY

counterbore(n = noun.artifact) countersink, countersink bit - a bit for enlarging the upper part of a hole;

is a kind of bit

counterbore, n.

A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head. [1913 Webster]
A kind of pin drill with the cutting edge or edges normal to the axis; -- used for enlarging a hole, or for forming a flat-bottomed recess at its mouth. [1913 Webster]

counterbore, v. t.

To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore. [1913 Webster]