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Definitions of counterbore

  1. a bit for enlarging the upper part of a hole Scrapingweb Dictionary DB
  2. A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head. Newage Dictionary DB
  3. 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. Newage Dictionary DB
  4. To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore. Newage Dictionary DB
  5. 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. dictgcide_fs
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