"boning rod" meaning in English

{
  "forms": [
    {
      "form": "boning rods",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "boning rod (plural boning rods)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1981, Peter Brett, Carpentry and Joinery for Building Craft Students",
          "text": "Figure 114 shows how pegs driven into the bottom of a foundation trench to establish a horizontal level for the concreter to work to, can be levelled with a boning rod held upright on the pages at either end of the trench.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A wooden rod shaped like a large T-square, used for establishing level surfaces."
      ],
      "id": "en-boning_rod-en-noun-yb~mWaME",
      "links": [
        [
          "wooden",
          "wooden"
        ],
        [
          "rod",
          "rod"
        ],
        [
          "T-square",
          "T-square"
        ]
      ]
    }
  ],
  "word": "boning rod"
}

{
  "forms": [
    {
      "form": "boning rods",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "boning rod (plural boning rods)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1981, Peter Brett, Carpentry and Joinery for Building Craft Students",
          "text": "Figure 114 shows how pegs driven into the bottom of a foundation trench to establish a horizontal level for the concreter to work to, can be levelled with a boning rod held upright on the pages at either end of the trench.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A wooden rod shaped like a large T-square, used for establishing level surfaces."
      ],
      "links": [
        [
          "wooden",
          "wooden"
        ],
        [
          "rod",
          "rod"
        ],
        [
          "T-square",
          "T-square"
        ]
      ]
    }
  ],
  "word": "boning rod"
}