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countersecure | countershaft | countershot | countersign | countersignature | countersink | countersink bit | counterspy | counterstain | counterstand | counterstatement



Noun, Verb (usu participle)


countersinkv. 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.  [1913 Webster]
  •  To cause to sink even with or below the surface; as, to countersink a screw or bolt into woodwork.  [1913 Webster]
  •  An enlargement of the upper part of a hole, forming a cavity or depression for receiving the head of a screw or bolt.  [1913 Webster]
    " 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."  [1913 Webster]
  •  A drill or cutting tool for countersinking holes.  [1913 Webster]


countersink, v.tr. (past and past part. -sunk)
1 enlarge and bevel (the rim of a hole) so that a screw or bolt can be inserted flush with the surface.
2 sink (a screw etc.) in such a hole.

For further exploring for "countersink" in Webster Dictionary Online

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