What does "counterbore" mean?
Counterbore: 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.
Additional senses
- 2.To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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- Published: 2026-07-17T00:00:00-07:00 · Modified: 2026-07-17T00:00:00-07:00