"-eir" meaning in Ancien français

{
  "categories": [
    {
      "kind": "other",
      "name": "Suffixes en ancien français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ancien français",
      "orig": "ancien français",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "suffix",
  "pos_title": "Suffixe",
  "senses": [
    {
      "alt_of": [
        {
          "word": "-er"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en ancien français",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Termes rares en ancien français",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Garin Le Loherain,f. 92v., 1ʳᵉ colonne, vers nᵒ 11 (manuscrit du XIIIᵉ siècle)",
          "text": "La veissiés paiens braire et crieir",
          "translation": "Là, vous voyiez des païens hurler et crier"
        }
      ],
      "glosses": [
        "Variante de -er (suffixe verbal)."
      ],
      "id": "fr--eir-fro-suffix-aRhkQ4PZ",
      "tags": [
        "alt-of",
        "rare"
      ]
    }
  ],
  "tags": [
    "morpheme"
  ],
  "word": "-eir"
}

{
  "categories": [
    "Suffixes en ancien français",
    "ancien français"
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "suffix",
  "pos_title": "Suffixe",
  "senses": [
    {
      "alt_of": [
        {
          "word": "-er"
        }
      ],
      "categories": [
        "Exemples en ancien français",
        "Termes rares en ancien français"
      ],
      "examples": [
        {
          "ref": "Garin Le Loherain,f. 92v., 1ʳᵉ colonne, vers nᵒ 11 (manuscrit du XIIIᵉ siècle)",
          "text": "La veissiés paiens braire et crieir",
          "translation": "Là, vous voyiez des païens hurler et crier"
        }
      ],
      "glosses": [
        "Variante de -er (suffixe verbal)."
      ],
      "tags": [
        "alt-of",
        "rare"
      ]
    }
  ],
  "tags": [
    "morpheme"
  ],
  "word": "-eir"
}