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Pronunciation varies by accent · noun
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..
Meronyms: flute, pilot (the land at the tip, which rides the hole as a guide), shank
Use counterbore when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Counterbore means 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..
Common synonyms include countersink, countersink bit.
The opposite depends on the specific sense.
Meronyms: flute, pilot (the land at the tip, which rides the hole as a guide), shank
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