"ies" meaning in Old French

{
  "head_templates": [
    {
      "args": {
        "1": "fro",
        "2": "verb form"
      },
      "expansion": "ies",
      "name": "head"
    }
  ],
  "lang": "Old French",
  "lang_code": "fro",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "estre"
        }
      ],
      "glosses": [
        "second-person singular imperfect indicative of estre"
      ],
      "id": "en-ies-fro-verb-8qNksbSq",
      "links": [
        [
          "estre",
          "estre#Old French"
        ]
      ],
      "tags": [
        "form-of",
        "imperfect",
        "indicative",
        "second-person",
        "singular"
      ]
    }
  ],
  "word": "ies"
}

{
  "categories": [
    "West Frisian common-gender nouns",
    "West Frisian entries with incorrect language header",
    "West Frisian lemmas",
    "West Frisian nouns",
    "West Frisian terms derived from Old Frisian",
    "West Frisian terms derived from Proto-Germanic",
    "West Frisian terms inherited from Old Frisian",
    "West Frisian terms inherited from Proto-Germanic",
    "West Frisian terms with IPA pronunciation"
  ],
  "head_templates": [
    {
      "args": {
        "1": "fro",
        "2": "verb form"
      },
      "expansion": "ies",
      "name": "head"
    }
  ],
  "lang": "Old French",
  "lang_code": "fro",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Old French entries with incorrect language header",
        "Old French non-lemma forms",
        "Old French verb forms"
      ],
      "form_of": [
        {
          "word": "estre"
        }
      ],
      "glosses": [
        "second-person singular imperfect indicative of estre"
      ],
      "links": [
        [
          "estre",
          "estre#Old French"
        ]
      ],
      "tags": [
        "form-of",
        "imperfect",
        "indicative",
        "second-person",
        "singular"
      ]
    }
  ],
  "word": "ies"
}