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  1. Oxford Dictionary

    counterbore

    • IPA[ˈkaʊntəbɔː]

    英式

    • n.
      a drilled hole that has a wider section at the top.；a drill whose bit has a uniform smaller diameter near the tip, for drilling counterbores in one operation.
    • v.
      drill a counterbore in (an object)

    • verb: counterbore, 3rd person present: counterbores, gerund or present participle: counterboring, past tense: counterbored, past participle: counterbored

    • noun: counterbore, plural noun: counterbores

    • 釋義

    名詞

    • 1. a drilled hole that has a wider section at the top.
    • ▪ a drill whose bit has a uniform smaller diameter near the tip, for drilling counterbores in one operation.

    動詞

    • 1. drill a counterbore in (an object) dies are counterbored to prevent material build-up