Counterbore

noun, verb

Definitions

Noun
  1. 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. 2
    a bit for enlarging the upper part of a hole wordnet
  3. 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. 1
    To create such a cylindrical recess. transitive

Etymology

Etymology 1

From counter- (“against”) + bore (“hole”).

Etymology 2

From counter- (“against”) + bore (“hole”).

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