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3 definitions found
 for countersink
From The Collaborative International Dictionary of English v.0.48 :

  Countersink \Coun"ter*sink`\ (koun"t[~e]r*s[i^][ng]k`; 277), v.
     t. [imp. & p. p. Countersunk (-s[u^][ng]k`); p. pr. & vb.
     n. Countersinking.]
     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.
        [1913 Webster]
  
     2. To cause to sink even with or below the surface; as, to
        countersink a screw or bolt into woodwork.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Countersink \Coun"ter*sink`\, 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.
        [1913 Webster]
  
     Note: 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]
  
     2. A drill or cutting tool for countersinking holes.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  countersink
      n 1: a hole (usually in wood) with the top part enlarged so that
           a screw or bolt will fit into it and lie below the surface
      2: a bit for enlarging the upper part of a hole [syn:
         counterbore, countersink, countersink bit]
      v 1: insert (a nail or screw below the surface, as into a
           countersink) [syn: set, countersink]

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