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Definition of 'countersink'


  1. 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
  2. a bit for enlarging the upper part of a hole
       Synonyms: counterbore countersink bit


  1. insert (a nail or screw below the surface, as into a countersink)
       Synonyms: set

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