"wiþþum" meaning in Old English

{
  "head_templates": [
    {
      "args": {
        "1": "ang",
        "2": "noun form"
      },
      "expansion": "wiþþum",
      "name": "head"
    }
  ],
  "lang": "Old English",
  "lang_code": "ang",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old English 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": "wiþþe"
        }
      ],
      "glosses": [
        "dative plural of wiþþe"
      ],
      "id": "en-wiþþum-ang-noun-2r-s9GX3",
      "links": [
        [
          "wiþþe",
          "wiþþe#Old_English"
        ]
      ],
      "tags": [
        "dative",
        "form-of",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈwiθ.θum/"
    }
  ],
  "word": "wiþþum"
}

{
  "head_templates": [
    {
      "args": {
        "1": "ang",
        "2": "noun form"
      },
      "expansion": "wiþþum",
      "name": "head"
    }
  ],
  "lang": "Old English",
  "lang_code": "ang",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Old English entries with incorrect language header",
        "Old English non-lemma forms",
        "Old English noun forms",
        "Old English terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "word": "wiþþe"
        }
      ],
      "glosses": [
        "dative plural of wiþþe"
      ],
      "links": [
        [
          "wiþþe",
          "wiþþe#Old_English"
        ]
      ],
      "tags": [
        "dative",
        "form-of",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈwiθ.θum/"
    }
  ],
  "word": "wiþþum"
}