| 释义 |
coun·ter·bore
I. \|kau̇ntə(r)+\ transitive verb
Etymology: counter- + bore
: to form a counterbore in : enlarge (part of a hole) by means of a counterbore
II. \ˈ ̷ ̷ ̷ ̷+ˌ-\ noun
1. : a flat-bottomed enlargement of the mouth of a cylindrical bore
2. : a drill for making a counterbore — compare countersink |