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Entry 3 senses · 2 variants Webster, 1913

Counterbore

/(-b?r`)/ · Coun·ter·bore · IPA
01 n. A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head.
  1. 1.
    A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head.
  2. 2.
    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.
02 v. t. To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.
  1. 1.
    To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.