"countersink" in the noun sense
1. countersink
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. counterbore, countersink, countersink bit
a bit for enlarging the upper part of a hole
"countersink" in the verb sense
1. set, countersink
insert (a nail or screw below the surface, as into a countersink)
Source: WordNet® (An amazing lexical database of English)
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