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countersink

The English word “countersink” has 4 meanings listed here.

noun

  1. 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.
  2. The cutter used to cut such a recess. (Also used, at less depth, for edge-breaking/deburring.)

verb

  1. To create such a conical recess.
  2. To cause to sink even with or below the surface.

Etymology

From counter- + sink.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.