| 单词 | countersink |
| 释义 | countersink v. , n. /kown"teuhr singk'/; v. also /kown'teuhr singk"/, v. , countersank, countersunk, countersinking, n. v.t. 1. to enlarge the upper part of (a cavity), esp. by chamfering, to receive the cone-shaped head of a screw, bolt, etc. 2. to cause (the head of a screw, bolt, etc.) to sink into a prepared depression so as to be flush with or below the surface. n. 3. a tool for countersinking a hole. 4. a countersunk hole. [1810-20; COUNTER- + SINK] |
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