| Definition of 'counterbore' |
Princeton's WordNet |
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1. (noun) counterbore, countersink, countersink bit
a bit for enlarging the upper part of a hole
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| Definition of 'counterbore' |
Webster Dictionary |
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1. (noun) counterbore
a flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head
2. (noun) counterbore
a kind of pin drill with the cutting edge or edges normal to the axis; -- used for enlarging a hole, or for forming a flat-bottomed recess at its mouth
3. (verb) counterbore
to form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore
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Definitions of counterbore 
