"плєсньцє" meaning in Vieux slave

{
  "categories": [
    {
      "kind": "other",
      "name": "Noms communs en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vieux slave",
      "orig": "vieux slave",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Dérivé de плєсна, plesna (« plante du pied »), avec le suffixe -ьцє, -ĭce."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "noun",
  "pos_id": "cu-nom-1",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Chaussures en vieux slave",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Sandale."
      ],
      "id": "fr-плєсньцє-cu-noun-VVYuP-Sb",
      "topics": [
        "clothing"
      ]
    }
  ],
  "tags": [
    "neuter"
  ],
  "word": "плєсньцє"
}

{
  "categories": [
    "Noms communs en vieux slave",
    "vieux slave"
  ],
  "etymology_texts": [
    "Dérivé de плєсна, plesna (« plante du pied »), avec le suffixe -ьцє, -ĭce."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "noun",
  "pos_id": "cu-nom-1",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Chaussures en vieux slave"
      ],
      "glosses": [
        "Sandale."
      ],
      "topics": [
        "clothing"
      ]
    }
  ],
  "tags": [
    "neuter"
  ],
  "word": "плєсньцє"
}