Underrunner

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The lower of a pair of grinding millstones.

    "FOR SALE AT A BARGAIN. […] Four run stones, Munson underrunners, 3 ft diameter."

  2. 2
    An additional runner added to the bottom of a sledge to protect the main runners in harsh conditions.

    "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. 3
    A runner (mechanical part intended to guide or aid something else to move) designed to be inserted underneath the item to be moved.

    "A triple tandem tow using underrunners. This method has been used for long ocean tows by tugs with a single-drum winch."

Example

More examples

"FOR SALE AT A BARGAIN. […] Four run stones, Munson underrunners, 3 ft diameter."

Etymology

From under- + runner.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.