Hypertext Webster Gateway: "countersink"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
2. To cause to sink even with or below the surface; as, to
countersink a screw or bolt into woodwork.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
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}.
2. A drill or cutting tool for countersinking holes.
From WordNet (r) 1.7 (wn)
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}]
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