See Also: counterbore(1)(dictionary)
counterbore(2)(dictionary)
counterbore(1) (iou)
counterbore noun. L19.
[from COUNTER- 2 + BORE noun1.]
A drilled hole that has a flat-bottomed enlargement at its mouth. L19.
A drill whose bit has a uniform smaller diameter near the tip, for drilling counterbores in one operation. L19.
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