"sourder" meaning in Ancien français

{
  "categories": [
    {
      "kind": "other",
      "name": "Verbes en ancien français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ancien français",
      "orig": "ancien français",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "verb",
  "pos_title": "Verbe",
  "senses": [
    {
      "alt_of": [
        {
          "word": "sourdre"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en ancien français",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Variante de sourdre."
      ],
      "id": "fr-sourder-fro-verb-nIj90sct",
      "tags": [
        "alt-of"
      ]
    }
  ],
  "word": "sourder"
}

{
  "categories": [
    "Verbes en ancien français",
    "ancien français"
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "verb",
  "pos_title": "Verbe",
  "senses": [
    {
      "alt_of": [
        {
          "word": "sourdre"
        }
      ],
      "categories": [
        "Wiktionnaire:Exemples manquants en ancien français"
      ],
      "glosses": [
        "Variante de sourdre."
      ],
      "tags": [
        "alt-of"
      ]
    }
  ],
  "word": "sourder"
}