counterbore Meaning, Definition & Usage
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noun a bit for enlarging the upper part of a hole
countersink bit; countersink.
WordNet
Coun"ter*bore` noun
Definitions
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A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head. -
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.
Coun`ter*bore" transitive verb
Definitions
To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.
