"筋金入り" meaning in Japanese

{
  "forms": [
    {
      "form": "筋金入り",
      "ruby": [
        [
          "筋",
          "すじ"
        ],
        [
          "金",
          "がね"
        ],
        [
          "入",
          "い"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "sujiganeiri",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "すじがね.いり"
      },
      "expansion": "筋(すじ)金(がね)入(い)り • (sujiganeiri)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "48 52",
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "55 45",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "46 54",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "hardcore"
      ],
      "id": "en-筋金入り-ja-noun-CHdRg7Ds",
      "links": [
        [
          "hardcore",
          "hardcore"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "48 52",
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "27 73",
          "kind": "other",
          "name": "Japanese terms with 3 kanji",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "55 45",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "46 54",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "dyed-in-the-wool"
      ],
      "id": "en-筋金入り-ja-noun-dWgUMYLf",
      "links": [
        [
          "dyed-in-the-wool",
          "dyed-in-the-wool"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "すじがねいり"
    },
    {
      "ipa": "[sɨʑiɡa̠ne̞iɾʲi]"
    }
  ],
  "word": "筋金入り"
}

{
  "categories": [
    "Japanese entries with incorrect language header",
    "Japanese lemmas",
    "Japanese links with redundant alt parameters",
    "Japanese links with redundant wikilinks",
    "Japanese nouns",
    "Japanese terms spelled with first grade kanji",
    "Japanese terms spelled with sixth grade kanji",
    "Japanese terms with 3 kanji",
    "Japanese terms with IPA pronunciation",
    "Japanese terms with redundant sortkeys",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "筋金入り",
      "ruby": [
        [
          "筋",
          "すじ"
        ],
        [
          "金",
          "がね"
        ],
        [
          "入",
          "い"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "sujiganeiri",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "すじがね.いり"
      },
      "expansion": "筋(すじ)金(がね)入(い)り • (sujiganeiri)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "hardcore"
      ],
      "links": [
        [
          "hardcore",
          "hardcore"
        ]
      ]
    },
    {
      "glosses": [
        "dyed-in-the-wool"
      ],
      "links": [
        [
          "dyed-in-the-wool",
          "dyed-in-the-wool"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "すじがねいり"
    },
    {
      "ipa": "[sɨʑiɡa̠ne̞iɾʲi]"
    }
  ],
  "word": "筋金入り"
}