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are perforating

  • present progressive
    of perforate.
    perforate
    verb (used with object)
    to make a hole or holes through by boring, punching, piercing, or the like.

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The lesser are best designated as gutter fractures, the deeper are perforating and gradually approximate themselves to the type of injury described as class 1.

From Surgical Experiences in South Africa, 1899-1900 Being Mainly a Clinical Study of the Nature and Effects of Injuries Produced by Bullets of Small Calibre by George Henry Makins