COUNTERSINK

v. n.

4 definitions — Webster’s Dictionary (1828)

1.
v.

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.
v.

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

3.
n.

An enlargement of the upper part of a hole, forming a cavity or depression for receiving the head of a screw or bolt.

4.
n.

A drill or cutting tool for countersinking holes.

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