"frein" meaning in Ancien français

{
  "categories": [
    {
      "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": "frein"
    }
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "noun",
  "pos_title": "Nom commun",
  "related": [
    {
      "word": "frain"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en ancien français",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Exemples en ancien français à traduire",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Lexique en ancien français de l’équitation",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Meraugis de Portlesguez, édition deMichelant, page 76, début du XIIIᵉ siècle",
          "text": "Di m’avant que ce signefie\nQue tu n’as frein n’esperon, di"
        },
        {
          "ref": "idem, manuscrit du Vatican, f. 108r.",
          "text": "n’as frain ne esperons"
        }
      ],
      "glosses": [
        "Frein."
      ],
      "id": "fr-frein-fro-noun-Z0gd5B~K",
      "topics": [
        "equestrianism"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "frein"
}

{
  "categories": [
    "Noms communs en ancien français",
    "ancien français"
  ],
  "derived": [
    {
      "lang": "Français",
      "lang_code": "fr",
      "word": "frein"
    }
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "noun",
  "pos_title": "Nom commun",
  "related": [
    {
      "word": "frain"
    }
  ],
  "senses": [
    {
      "categories": [
        "Exemples en ancien français",
        "Exemples en ancien français à traduire",
        "Lexique en ancien français de l’équitation"
      ],
      "examples": [
        {
          "ref": "Meraugis de Portlesguez, édition deMichelant, page 76, début du XIIIᵉ siècle",
          "text": "Di m’avant que ce signefie\nQue tu n’as frein n’esperon, di"
        },
        {
          "ref": "idem, manuscrit du Vatican, f. 108r.",
          "text": "n’as frain ne esperons"
        }
      ],
      "glosses": [
        "Frein."
      ],
      "topics": [
        "equestrianism"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "frein"
}