counterbore
English
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/Counterbore_hole_stainless_steel.jpg/220px-Counterbore_hole_stainless_steel.jpg)
Etymology
From counter- (“against”) + bore (“hole”).
Noun
counterbore (plural counterbores)
- A cylindrical recess, typically machined around a hole to admit a screw so that it sits flush with a surface.
- The tool with which a counterbore is machined.
Translations
recess-machining tool
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Verb
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- (transitive) To create such a cylindrical recess.