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Entry 4 senses · 2 variants Webster, 1913

Countersink

/(koun"tẽr*sĭṉk`; 277)/ · Coun·ter·sink · IPA
01 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 …
imp. & p. p. Countersunk; p. pr. & vb. n. Countersinking
  1. 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. 2.
    To cause to sink even with or below the surface; as, to countersink a screw or bolt into woodwork.
02 n. An enlargement of the upper part of a hole, forming a cavity or depression for receiving the head of a screw or bolt.
  1. 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. 2.
    A drill or cutting tool for countersinking holes.