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countersink    
vt. 钻孔装埋,打埋头孔于
n. 皿锥,埋头孔,暗钉眼

钻孔装埋,打埋头孔於皿锥,埋头孔,暗钉眼

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 [synonym:
{counterbore}, {countersink}, {countersink bit}]
v 1: insert (a nail or screw below the surface, as into a
countersink) [synonym: {set}, {countersink}]

Countersink \Coun"ter*sink`\ (koun"t[~e]r*s[i^][ng]k`; 277), v.
t. [imp. & p. p. {Countersunk} (-s[u^][ng]k`); 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.
[1913 Webster]

2. To cause to sink even with or below the surface; as, to
countersink a screw or bolt into woodwork.
[1913 Webster]


Countersink \Coun"ter*sink`\, n.
1. An enlargement of the upper part of a hole, forming a
cavity or depression for receiving the head of a screw or
bolt.
[1913 Webster]

Note: In the United States a flaring cavity formed by
chamfering the edges of a round hole is called a
countersink, while a cylindrical flat-bottomed
enlargement of the mouth of the hole is usually called
{a conterbore}.
[1913 Webster]

2. A drill or cutting tool for countersinking holes.
[1913 Webster]


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  • meaning - What does counter refer to in countersink? - English . . .
    The all important question is what counters what I think 'counter' in both 'countersink' and 'counterbore' refers to the relation between primary (often cylindrical) hole and subsequently created cone or secondary bore The secondary cone bore counters the primary bore To see that, imagine what happens during creation of secondary cone bore
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