Counterbore Definition

noun

A cylindrical recess, typically machined around a hole to admit a screw so that it sits flush with a surface.

Wiktionary

The tool with which a counterbore is machined.

Wiktionary
Synonyms:
verb
To create such a cylindrical recess.
Wiktionary

Other Word Forms of Counterbore

Noun

Singular:
counterbore
Plural:
counterbores

Origin of Counterbore

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

    From Wiktionary

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counterbore