counterbore

Noun, Verb (transitive)

coun=ter=bore

CIDE DICTIONARY

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]

For further exploring for "counterbore" in Webster Dictionary Online

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