Countersunk definitions Webster's 1913 Dictionary Countersunk Coun"ter*sunk` (-s?nk`), p. p. & a. from Countersink ... 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. Webster's 1913 Dictionary Countersink Coun"ter*sink` (koun ... s[i^][ng]k`; 277), v. t. [imp. & p. p. Countersunk (-s[u^][ng]k`); p. pr. & vb. n. Countersinking.] 1 ...
... countersink) [syn: set, countersink] Merriam Webster's I. transitive verb (countersunk; -sinking) Date: 1816 1. to make a countersink on (a ... s[i^][ng]k`; 277), v. t. [imp. & p. p. Countersunk (-s[u^][ng]k`); p. pr. & vb. n. Countersinking.] 1 ...