"esfors" meaning in Ancien français

{
  "categories": [
    {
      "kind": "other",
      "name": "Déverbaux en ancien français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en ancien français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ancien français",
      "orig": "ancien français",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "lang": "Français",
      "lang_code": "fr",
      "word": "effort"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "effort"
    }
  ],
  "etymology_texts": [
    "Déverbal de esforcier."
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en ancien français",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Exemples en ancien français à traduire",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "La Chanson des quatre fils Aymon, c.a. XIIᵉ siècle, transcription de Ferdinand Castet",
          "text": "Mais ce fu par l’esfors d’une paiene gent\nQui tornerent en fuie com traïtor pullent."
        }
      ],
      "glosses": [
        "Effort."
      ],
      "id": "fr-esfors-fro-noun-h~lBkl~H"
    }
  ],
  "synonyms": [
    {
      "word": "esforce"
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "esfors"
}

{
  "categories": [
    "Déverbaux en ancien français",
    "Noms communs en ancien français",
    "ancien français"
  ],
  "derived": [
    {
      "lang": "Français",
      "lang_code": "fr",
      "word": "effort"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "effort"
    }
  ],
  "etymology_texts": [
    "Déverbal de esforcier."
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Exemples en ancien français",
        "Exemples en ancien français à traduire"
      ],
      "examples": [
        {
          "ref": "La Chanson des quatre fils Aymon, c.a. XIIᵉ siècle, transcription de Ferdinand Castet",
          "text": "Mais ce fu par l’esfors d’une paiene gent\nQui tornerent en fuie com traïtor pullent."
        }
      ],
      "glosses": [
        "Effort."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "esforce"
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "esfors"
}