"fermir" meaning in Middle French

{
  "head_templates": [
    {
      "args": {
        "1": "frm",
        "2": "verb"
      },
      "expansion": "fermir",
      "name": "head"
    }
  ],
  "lang": "Middle French",
  "lang_code": "frm",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Middle French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "to firm up (make firmer)"
      ],
      "id": "en-fermir-frm-verb-M~kqqCjO",
      "links": [
        [
          "firm up",
          "firm up"
        ]
      ]
    }
  ],
  "word": "fermir"
}

{
  "head_templates": [
    {
      "args": {
        "1": "frm",
        "2": "verb"
      },
      "expansion": "fermir",
      "name": "head"
    }
  ],
  "lang": "Middle French",
  "lang_code": "frm",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Middle French entries with incorrect language header",
        "Middle French lemmas",
        "Middle French verbs"
      ],
      "glosses": [
        "to firm up (make firmer)"
      ],
      "links": [
        [
          "firm up",
          "firm up"
        ]
      ]
    }
  ],
  "word": "fermir"
}