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Definition of: counterbore
(koun′tər·bôr′, -bōr′) noun Mech.
1. A cylindrical enlargement of the end of a cylinder bore or of a borehole.
2. A form of drill used for enlarging one end of a hole.
—v.t. ·bored, ·bor·ing To form a counterbore in; also, to enlarge.
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