counterbore

== English == === Etymology === From counter- (“against”) + bore (“hole”). === Noun === counterbore (plural counterbores) 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. Coordinate term: countersink (conical) The cutter used to cut such a recess. (Also used, at less depth, for spotfacing.) Hypernyms: cutter, cutting tool Meronyms: flute, pilot (the land at the tip, which rides the hole as a guide), shank Coordinate terms: countersink (conical); drill, drill bit; reamer; endmill ==== Translations ==== ==== See also ==== === Verb === counterbore (third-person singular simple present counterbores, present participle counterboring, simple past and past participle counterbored) (transitive) To create such a cylindrical recess. Coordinate terms: countersink (verb), spotface (verb) ==== Derived terms ====