"first finger" meaning in English

{
  "forms": [
    {
      "form": "first fingers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "first finger (plural first fingers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "99 1",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "99 1",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "99 1",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "70 30",
          "kind": "topical",
          "langcode": "en",
          "name": "Fingers",
          "orig": "en:Fingers",
          "parents": [
            "Body",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "index finger"
      ],
      "id": "en-first_finger-en-noun-7cN9qpy4",
      "links": [
        [
          "index finger",
          "index finger"
        ]
      ],
      "qualifier": "bowed string instruments",
      "raw_glosses": [
        "(bowed string instruments) index finger"
      ]
    },
    {
      "glosses": [
        "thumb"
      ],
      "id": "en-first_finger-en-noun-Be7sLXCE",
      "links": [
        [
          "thumb",
          "thumb"
        ]
      ],
      "qualifier": "keyboard instruments",
      "raw_glosses": [
        "(keyboard instruments) thumb"
      ]
    }
  ],
  "word": "first finger"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries",
    "en:Fingers"
  ],
  "forms": [
    {
      "form": "first fingers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "first finger (plural first fingers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "index finger"
      ],
      "links": [
        [
          "index finger",
          "index finger"
        ]
      ],
      "qualifier": "bowed string instruments",
      "raw_glosses": [
        "(bowed string instruments) index finger"
      ]
    },
    {
      "glosses": [
        "thumb"
      ],
      "links": [
        [
          "thumb",
          "thumb"
        ]
      ],
      "qualifier": "keyboard instruments",
      "raw_glosses": [
        "(keyboard instruments) thumb"
      ]
    }
  ],
  "word": "first finger"
}