underrunner

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English

Etymology

From under- +‎ runner.

Pronunciation

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Noun

underrunner (plural underrunners)

  1. The lower of a pair of grinding millstones.
    • 1890, The Northwestern Miller, volume 29, page 563:
      FOR SALE AT A BARGAIN. Four run stones, Munson underrunners, 3 ft diameter.
    • 1896, Great Britain. Patent Office, Patents for Inventions. Abridgments of Specifications, page 11:
      The arrangement is preferably applied to an underrunner mill.
  2. An additional runner added to the bottom of a sledge to protect the main runners in harsh conditions.
    • 2002, Paul Simpson-Housley, Antarctica: Exploration, Perception and Metaphor, page 36:
      Less than half a mile to the south the party sighted an underrunner of a sledge, and assumed it to mark the location the Norwegians had assigned for 90°S.
  3. A runner (mechanical part intended to guide or aid something else to move) designed to be inserted underneath the item to be moved.
    • 1989, John S. Blank, Modern Towing, page 302:
      A triple tandem tow using underrunners. This method has been used for long ocean tows by tugs with a single-drum winch.