"þeim" meaning in Middle English

{
  "head_templates": [
    {
      "args": {
        "1": "enm",
        "2": "pronoun"
      },
      "expansion": "þeim",
      "name": "head"
    }
  ],
  "lang": "Middle English",
  "lang_code": "enm",
  "pos": "pron",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "them",
          "word": "þem"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Middle English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Middle English pronouns",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "22 21 22 19 8 8",
          "kind": "other",
          "name": "Old Norse entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Alternative form of þem (“them”)"
      ],
      "id": "en-þeim-enm-pron-S39E8sL1",
      "links": [
        [
          "þem",
          "þem#Middle English"
        ]
      ],
      "synonyms": [
        {
          "word": "theim"
        }
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "þeim"
}

{
  "categories": [
    "Old Norse entries with incorrect language header",
    "Old Norse non-lemma forms",
    "Old Norse pronoun forms",
    "Old Norse terms derived from Proto-Germanic",
    "Old Norse terms inherited from Proto-Germanic"
  ],
  "head_templates": [
    {
      "args": {
        "1": "enm",
        "2": "pronoun"
      },
      "expansion": "þeim",
      "name": "head"
    }
  ],
  "lang": "Middle English",
  "lang_code": "enm",
  "pos": "pron",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "them",
          "word": "þem"
        }
      ],
      "categories": [
        "Middle English entries with incorrect language header",
        "Middle English lemmas",
        "Middle English pronouns"
      ],
      "glosses": [
        "Alternative form of þem (“them”)"
      ],
      "links": [
        [
          "þem",
          "þem#Middle English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "theim"
    }
  ],
  "word": "þeim"
}