counterbore | English to English Dictionary

a bit for enlarging the upper part of a hole(noun.artifact)

Synonym:
countersink, countersink bit

source: wordnet30
A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head.(noun)

source: webster1913

To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.(verb)

source: webster1913

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