"underrunner" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "runner"
      },
      "expansion": "under- + runner",
      "name": "pre"
    }
  ],
  "etymology_text": "under- + runner",
  "forms": [
    {
      "form": "underrunners",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "underrunner (plural underrunners)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "45 47 8",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "27 36 37",
          "kind": "other",
          "name": "English terms prefixed with under-",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1890, The Northwestern Miller, volume 29, page 563",
          "text": "FOR SALE AT A BARGAIN. […] Four run stones, Munson underrunners, 3 ft diameter.",
          "type": "quotation"
        },
        {
          "ref": "1896, Great Britain. Patent Office, Patents for Inventions. Abridgments of Specifications, page 11",
          "text": "The arrangement is preferably applied to an underrunner mill.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The lower of a pair of grinding millstones."
      ],
      "id": "en-underrunner-en-noun-a9rXCWuf",
      "links": [
        [
          "millstone",
          "millstone"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "45 47 8",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "27 36 37",
          "kind": "other",
          "name": "English terms prefixed with under-",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "2002, Paul Simpson-Housley, Antarctica: Exploration, Perception and Metaphor, page 36",
          "text": "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.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An additional runner added to the bottom of a sledge to protect the main runners in harsh conditions."
      ],
      "id": "en-underrunner-en-noun-BTiUZtTL",
      "links": [
        [
          "runner",
          "runner"
        ],
        [
          "sledge",
          "sledge"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "27 36 37",
          "kind": "other",
          "name": "English terms prefixed with under-",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1989, John S. Blank, Modern Towing, page 302",
          "text": "A triple tandem tow using underrunners. This method has been used for long ocean tows by tugs with a single-drum winch.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A runner (mechanical part intended to guide or aid something else to move) designed to be inserted underneath the item to be moved."
      ],
      "id": "en-underrunner-en-noun-qkg7J~VT",
      "links": [
        [
          "runner",
          "runner"
        ]
      ]
    }
  ],
  "word": "underrunner"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
    "English terms prefixed with under-"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "runner"
      },
      "expansion": "under- + runner",
      "name": "pre"
    }
  ],
  "etymology_text": "under- + runner",
  "forms": [
    {
      "form": "underrunners",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "underrunner (plural underrunners)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1890, The Northwestern Miller, volume 29, page 563",
          "text": "FOR SALE AT A BARGAIN. […] Four run stones, Munson underrunners, 3 ft diameter.",
          "type": "quotation"
        },
        {
          "ref": "1896, Great Britain. Patent Office, Patents for Inventions. Abridgments of Specifications, page 11",
          "text": "The arrangement is preferably applied to an underrunner mill.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The lower of a pair of grinding millstones."
      ],
      "links": [
        [
          "millstone",
          "millstone"
        ]
      ]
    },
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2002, Paul Simpson-Housley, Antarctica: Exploration, Perception and Metaphor, page 36",
          "text": "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.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An additional runner added to the bottom of a sledge to protect the main runners in harsh conditions."
      ],
      "links": [
        [
          "runner",
          "runner"
        ],
        [
          "sledge",
          "sledge"
        ]
      ]
    },
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1989, John S. Blank, Modern Towing, page 302",
          "text": "A triple tandem tow using underrunners. This method has been used for long ocean tows by tugs with a single-drum winch.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A runner (mechanical part intended to guide or aid something else to move) designed to be inserted underneath the item to be moved."
      ],
      "links": [
        [
          "runner",
          "runner"
        ]
      ]
    }
  ],
  "word": "underrunner"
}