/'kaʊntəsɪŋk; `kauntɚ,sɪŋk/
v (pt -sank /-sNk; -9sANk/, pp -sunk / -sQNk; -9sQNk/) [Tn usu passive通常用于被动语态 ]
1 enlarge the top of (a hole) so that the head of a screw or bolt fits into it level with or below the surrounding surface 钻埋头孔.
2 insert (a screw or bolt) into such an enlarged hole 将（螺钉或螺栓）旋入埋头孔中.