"fierer" meaning in Moyen français

{
  "categories": [
    {
      "kind": "other",
      "name": "Adjectifs en moyen français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Moyen français",
      "orig": "moyen français",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "du latin ferus"
  ],
  "lang": "Moyen français",
  "lang_code": "frm",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en moyen français",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Exemples en moyen français à traduire",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Chr. de Rains, p. 62",
          "text": "Si fist fierer le tronc de bandes de fier tout entour"
        }
      ],
      "glosses": [
        "fier"
      ],
      "id": "fr-fierer-frm-adj-OSLvNS8i",
      "raw_tags": [
        "Picard"
      ]
    }
  ],
  "word": "fierer"
}

{
  "categories": [
    "Adjectifs en moyen français",
    "moyen français"
  ],
  "etymology_texts": [
    "du latin ferus"
  ],
  "lang": "Moyen français",
  "lang_code": "frm",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "categories": [
        "Exemples en moyen français",
        "Exemples en moyen français à traduire"
      ],
      "examples": [
        {
          "ref": "Chr. de Rains, p. 62",
          "text": "Si fist fierer le tronc de bandes de fier tout entour"
        }
      ],
      "glosses": [
        "fier"
      ],
      "raw_tags": [
        "Picard"
      ]
    }
  ],
  "word": "fierer"
}