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countersink

noun, verb — 4 senses

countersink

noun

Etymology From counter- + sink.

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.)

  • Holonym: center drill (combined drill and countersink)

countersink

verb

Etymology From counter- + sink.

1

To create such a conical recess.

  • to countersink a hole for a screw
2

Ambitransitive To cause to sink even with or below the surface.

  • to countersink a screw or bolt into woodwork
  • I countersank into the locust just enough to make the nailhead flush.2010, Larry Pardey, Details of Classic Boat Construction, pages 7-30:
Derived terms
back-countersink, countersinker
Related terms
diesinking, sink, spotface

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.

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