| 单词 | countersunk bit |
| 释义 | > as lemmascountersunk bit (See quots.); = countersink n. 2. Hence †countersunk bit. Obsolete. ΘΚΠ the world > space > relative position > condition of being open or not closed > an opening or aperture > [noun] > a hole bored, pierced, or perforated > enlarging > an enlargement countersunk1794 countersink1846 counterborea1884 1794 D. Steel Elements & Pract. Rigging & Seamanship I. 151 Countersunk, a hollow, cut by a bit round the edge of a hole. Counter-sunk bit, a bit having two cutting edges at the end, reversed to each other, which form an angle from the point. 1850 J. Greenwood Sailor's Sea-bk. 112 Countersunk, the hollows in iron plates, &c. which are excavated by an instrument called a countersunk bitt, to receive the heads of screws or nails. < as lemmas |
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