countersink
noun, verb
Forms countersinks countersinking countersank countersunk
- noun A conical recess, typically machined at the mouth of a hole to admit a screw (with a matching taper) so that the screw sits flush with a surface.
- noun The cutter used to cut such a recess. (Also used, at less depth, for edge-breaking/deburring.)
- verb (transitive) To create such a conical recess. “to countersink a hole for a screw”
- verb (ambitransitive) To cause to sink even with or below the surface. “to countersink a screw or bolt into woodwork”
Synonyms
Webster’s 1913
- verb To chamfer or form a depression around the top of (a hole in wood, metal, etc.) for the reception of the head of a screw or bolt below the surface, either wholly or in part; as, to countersink a hole for a screw.
- verb To cause to sink even with or below the surface; as, to countersink a screw or bolt into woodwork.
- noun An enlargement of the upper part of a hole, forming a cavity or depression for receiving the head of a screw or bolt.
- noun A drill or cutting tool for countersinking holes.
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “countersink”, CC BY-SA 4.0. Details