countersunk
埋頭的; 埋頭孔; 錐孔; 沈孔
Coun·ter·sink v. t. [imp. & p. p. Countersunk p. pr. & vb. n. Countersinking.]
1. To chamfer or form a depression around the top of (a hole in wood, metal, etc.) for the reception of the head of a screw or bolt below the surface, either wholly or in part; as, to countersink a hole for a screw.
2. To cause to sink even with or below the surface; as, to countersink a screw or bolt into woodwork.
Coun·ter·sunk p. p. & a. from Countersink.
1. Chamfered at the top; -- said of a hole.
2. Sunk into a chamfer; as, a countersunk bolt.
3. Beveled on the lower side, so as to fit a chamfered countersink; as, a countersunk nailhead.
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countersink
n 1: a hole (usually in wood) with the top part enlarged so that
a screw or bolt will fit into it and lie below the
surface
2: a bit for enlarging the upper part of a hole [syn: counterbore,
countersink bit]
v : insert (a nail or screw below the surface, as into a
countersink) [syn: set]
[also: countersunk, countersank]