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Counterbore

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(1):

(n.) 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.

(2):

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

(3):

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