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The Collaborative International Dictionary of English v.0.48 (gcide)

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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