"jostakin" meaning in Finnish

{
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "pronoun form"
      },
      "expansion": "jostakin",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Finnish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "from somewhere, (of) something, etc",
          "word": "jokin"
        }
      ],
      "glosses": [
        "elative singular of jokin: from somewhere, (of) something, etc."
      ],
      "id": "en-jostakin-fi-pron-pMSfMm3w",
      "links": [
        [
          "jokin",
          "jokin#Finnish"
        ],
        [
          "somewhere",
          "somewhere"
        ]
      ],
      "synonyms": [
        {
          "word": "jostain"
        }
      ],
      "tags": [
        "elative",
        "form-of",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈjostɑkin/"
    },
    {
      "ipa": "[ˈjo̞s̠tɑ̝k̟in]"
    },
    {
      "rhymes": "-ostɑkin"
    }
  ],
  "word": "jostakin"
}

{
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "pronoun form"
      },
      "expansion": "jostakin",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        "Finnish 3-syllable words",
        "Finnish entries with incorrect language header",
        "Finnish non-lemma forms",
        "Finnish pronoun forms",
        "Finnish terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries",
        "Rhymes:Finnish/ostɑkin",
        "Rhymes:Finnish/ostɑkin/3 syllables"
      ],
      "form_of": [
        {
          "extra": "from somewhere, (of) something, etc",
          "word": "jokin"
        }
      ],
      "glosses": [
        "elative singular of jokin: from somewhere, (of) something, etc."
      ],
      "links": [
        [
          "jokin",
          "jokin#Finnish"
        ],
        [
          "somewhere",
          "somewhere"
        ]
      ],
      "tags": [
        "elative",
        "form-of",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈjostɑkin/"
    },
    {
      "ipa": "[ˈjo̞s̠tɑ̝k̟in]"
    },
    {
      "rhymes": "-ostɑkin"
    }
  ],
  "synonyms": [
    {
      "word": "jostain"
    }
  ],
  "word": "jostakin"
}