countersinks

Noun

• 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
• plural of countersink

Verb

• insert (a nail or screw below the surface, as into a countersink)
• third-person singular simple present indicative of countersink

Synonyms

counterbore, countersink, countersink bit, set