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Countersink
Open directlyWebster's 1828 Dictionary · 1828 1 of 2
Part of speech: noun (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.
2. A drill or cutting tool for countersinking holes.
Webster's 1828 Dictionary · 1828 2 of 2
Part of speech: verb (v.)
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.