"žákem" meaning in Czech

{
  "head_templates": [
    {
      "args": {
        "1": "cs",
        "2": "noun form"
      },
      "expansion": "žákem",
      "name": "head"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Czech 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": [
        {
          "word": "žák"
        }
      ],
      "glosses": [
        "instrumental singular of žák"
      ],
      "id": "en-žákem-cs-noun-l8IlupMy",
      "links": [
        [
          "žák",
          "žák#Czech"
        ]
      ],
      "tags": [
        "form-of",
        "instrumental",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈʒaːkɛm]"
    }
  ],
  "word": "žákem"
}

{
  "head_templates": [
    {
      "args": {
        "1": "cs",
        "2": "noun form"
      },
      "expansion": "žákem",
      "name": "head"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Czech entries with incorrect language header",
        "Czech non-lemma forms",
        "Czech noun forms",
        "Czech terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "word": "žák"
        }
      ],
      "glosses": [
        "instrumental singular of žák"
      ],
      "links": [
        [
          "žák",
          "žák#Czech"
        ]
      ],
      "tags": [
        "form-of",
        "instrumental",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈʒaːkɛm]"
    }
  ],
  "word": "žákem"
}