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Counterbore
noun, verb
Definitions
Noun
- 1 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.
- 2 a bit for enlarging the upper part of a hole wordnet
- 3 The cutter used to cut such a recess. (Also used, at less depth, for spotfacing.)
"Meronyms: flute, pilot (the land at the tip, which rides the hole as a guide), shank"
Verb
- 1 To create such a cylindrical recess. transitive
Etymology
Etymology 1
From counter- (“against”) + bore (“hole”).
Etymology 2
From counter- (“against”) + bore (“hole”).
See also for "counterbore"
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