Search Result for "countersinking": 

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]