Definitions from Wiktionary (countersink)

▸ 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.
▸ verb:  (ambitransitive) To cause to sink even with or below the surface.
▸ Also see countersink



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