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countersunk 埋头的; 埋头孔; 锥孔; 沉孔 埋头的; 埋头孔; 锥孔; 沈孔 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]
Countersunk \ Coun" ter* sunk`\ (- s? nk`), p. p. & a. from { Countersink}. 1. Chamfered at the top; -- said of a hole. [ 1913 Webster] 2. Sunk into a chamfer; as, a countersunk bolt. [ 1913 Webster] 3. Beveled on the lower side, so as to fit a chamfered countersink; as, a countersunk nailhead. [ 1913 Webster]
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