counterbore

/ˈkaʊntərˌbɔər/
IPA guide

Other forms: counterbores

Definitions of counterbore
  1. noun
    a bit for enlarging the upper part of a hole
    synonyms: countersink, countersink bit
    see moresee less
    type of:
    bit
    the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press
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