countersink
noun
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 countersink
A bit for enlarging the upper part of a hole.
synonyms: counterbore, countersink bit.
verb
1 countersink
Insert (a nail or screw below the surface, as into a countersink).
synonym: set.
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