English dictionary
counterbore
/'k/AU/nt/@/r,b/oU/r/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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a bit for enlarging the upper part of a hole
Source: WordNet 3.0
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A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head.
Source: webster1913
verb
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To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.
Source: webster1913