| 单词 | counterbore |
| 释义 | counterbore —counterborer, n. /kown"teuhr bawr', -bohr'; kown"teuhr bawr", -bohr"/, n. , v. , counterbored, counterboring. n. 1. a tool for enlarging a drilled hole for a portion of its length, as to permit sinking a screw head. 2. the portion of the hole so enlarged. v.t. 3. to enlarge (a drilled hole) along part of the length of the hole by drilling with a bit having a greater diameter. [1605-15; COUNTER- + BORE1] |
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