DICT.TW Dictionary Taiwan

 countersunk
 埋頭的; 埋頭孔; 錐孔; 沈孔

 Coun·ter·sink v. t. [imp. & p. p.  Countersunk 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.
 2. To cause to sink even with or below the surface; as, to countersink a screw or bolt into woodwork.

 Coun·ter·sunk p. p. & a. from Countersink.
 1. Chamfered at the top; -- said of a hole.
 2. Sunk into a chamfer; as, a countersunk bolt.
 3. Beveled on the lower side, so as to fit a chamfered countersink; as, a countersunk nailhead.
 ◄ ►

 countersunk
      See countersink

 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 bit]
      v : insert (a nail or screw below the surface, as into a
          countersink) [syn: set]
      [also: countersunk, countersank]