Definitions from Wiktionary (counterbore)

▸ noun:  A cylindrical recess, typically machined at the mouth of a hole to admit a screw (such as a cap screw) so that the screw sits flush with a surface.
▸ noun:  The cutter used to cut such a recess. (Also used, at less depth, for spotfacing.)
▸ verb:  (transitive) To create such a cylindrical recess.



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