countersunk

Coun"ter*sunk` (-snk`), p. p. & a. from Countersink. 1. Chamfered at the top; -- said 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.

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