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Definitions for: Countersink [n] a bit for enlarging the upper part of a hole
[n] 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
[v] insert (a nail or screw below the surface, as into a countersink)
Webster (1913) Definition: 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.
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.
Synonyms: counterbore, countersink bit, set
See Also: bit, bury, hole, sink
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