| 单词 | countersinker |
| 释义 | > as lemmasˈcountersinker ˈcountersinker n. (a) a tool for countersinking; = countersink n. 1; (b) one who operates a countersinking machine. ΘΚΠ society > occupation and work > equipment > piercing or boring tools > [noun] > tools for enlarging holes > countersink countersink1815 countersinker1881 counterbore1939 1881 Mechanic §319 The rose or roundheaded countersinker. 1881 Instr. Census Clerks (1885) 97 1921 Dict. Occup. Terms (1927) § 200 < as lemmas |
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