Wiktionary
countersank
vb. (en-simple past of: countersink)
WordNet
countersank
See countersink
countersink
n. 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
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]
Usage examples of "countersank".
He knew he didn’t have his brother’s craftsmanship, but he countersank every screw and lovingly sanded the wood.