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Countersink

noun, verb

Definitions

Noun
  1. 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. 2
    a bit for enlarging the upper part of a hole wordnet
  3. 3
    The cutter used to cut such a recess. (Also used, at less depth, for edge-breaking/deburring.)

    "Holonym: center drill (combined drill and countersink)"

  4. 4
    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 wordnet
Verb
  1. 1
    To create such a conical recess. transitive

    "to countersink a hole for a screw"

  2. 2
    insert (a nail or screw below the surface, as into a countersink) wordnet
  3. 3
    To cause to sink even with or below the surface. ambitransitive

    "to countersink a screw or bolt into woodwork"

Etymology

Etymology 1

From counter- + sink.

Etymology 2

From counter- + sink.

See also for "countersink"

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