4 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: 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 [gcide]: 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] From WordNet (r) 2.0 [wn]: countersunk See {countersink} From WordNet (r) 2.0 [wn]: 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}]
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