Definition of countersink
- v. t. - 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.
- v. t. - To cause to sink even with or below the surface;
as, to countersink a screw or bolt into woodwork.
- n. - An enlargement of the upper part of a hole, forming a
cavity or depression for receiving the head of a screw or bolt.
- n. - A drill or cutting tool for countersinking holes.