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Countersink

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Countersinking

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Webster Dictionary
• Countersinking
• Countersink

(1):

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

(2):

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

(3):

(n.) A drill or cutting tool for countersinking holes.

(4):

(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.