"чему" meaning in Russian

{
  "forms": [
    {
      "form": "чему́",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "čemú",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "pronoun form",
        "head": "чему́"
      },
      "expansion": "чему́ • (čemú)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "_dis": "85 6 0 9",
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "87 5 0 7",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "form_of": [
        {
          "extra": "što",
          "word": "что"
        }
      ],
      "glosses": [
        "dative of что (što)"
      ],
      "id": "en-чему-ru-pron-peg9-Yth",
      "links": [
        [
          "что",
          "что#Russian"
        ]
      ],
      "tags": [
        "dative",
        "form-of"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[t͡ɕɪˈmu]"
    }
  ],
  "word": "чему"
}

{
  "categories": [
    "Pages with 2 entries",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "чему́",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "čemú",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "pronoun form",
        "head": "чему́"
      },
      "expansion": "чему́ • (čemú)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        "Pages with 2 entries",
        "Pages with entries",
        "Russian 2-syllable words",
        "Russian entries with incorrect language header",
        "Russian non-lemma forms",
        "Russian pronoun forms",
        "Russian terms with IPA pronunciation"
      ],
      "form_of": [
        {
          "extra": "što",
          "word": "что"
        }
      ],
      "glosses": [
        "dative of что (što)"
      ],
      "links": [
        [
          "что",
          "что#Russian"
        ]
      ],
      "tags": [
        "dative",
        "form-of"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[t͡ɕɪˈmu]"
    }
  ],
  "word": "чему"
}