Countersunk

(imp. & p. p.) of Countersink

(p. p. & a.) Chamfered at the top; -- said of a hole.

(p. p. & a.) Sunk into a chamfer; as, a countersunk bolt.

(p. p. & a.) Beveled on the lower side, so as to fit a chamfered countersink; as, a countersunk nailhead.

约西亚整理

• When the rail has been formed, the ivory diamond-shaped squares and name plate are countersunk into the top. 佚名. 神奇的知识之书.
• Screw holes, countersunk, are bored from the top down through the slabs, around the outer edges, through which the slate is screwed to the frame. 佚名. 神奇的知识之书.

约西亚整理