"шись" meaning in Moksha

{
  "etymology_templates": [
    {
      "args": {
        "1": "mdf",
        "2": "ши",
        "3": "-сь"
      },
      "expansion": "ши (ši) + -сь (-ś)",
      "name": "affix"
    }
  ],
  "etymology_text": "From ши (ši) + -сь (-ś).",
  "forms": [
    {
      "form": "šiś",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "mdf",
        "2": "noun form"
      },
      "expansion": "шись • (šiś)",
      "name": "head"
    }
  ],
  "lang": "Moksha",
  "lang_code": "mdf",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Moksha entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Moksha terms suffixed with -сь",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "What day is today?",
          "ref": "O. Je. Poljakov (1993) Russko-mokšanskij razgovornik [Russian-Moksha phrasebook], Saransk: Mordovskoje knižnoje izdatelʹstvo, page 70",
          "roman": "Kodama ťači šiś ?",
          "text": "Кодама тячи шись?",
          "type": "example"
        }
      ],
      "form_of": [
        {
          "extra": "(ši); the day",
          "word": "ши"
        }
      ],
      "glosses": [
        "definite singular nominative of ши (ši); the day"
      ],
      "id": "en-шись-mdf-noun-ctXK7cU6",
      "links": [
        [
          "ши",
          "ши#Moksha"
        ]
      ],
      "tags": [
        "definite",
        "form-of",
        "nominative",
        "singular"
      ]
    }
  ],
  "word": "шись"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "mdf",
        "2": "ши",
        "3": "-сь"
      },
      "expansion": "ши (ši) + -сь (-ś)",
      "name": "affix"
    }
  ],
  "etymology_text": "From ши (ši) + -сь (-ś).",
  "forms": [
    {
      "form": "šiś",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "mdf",
        "2": "noun form"
      },
      "expansion": "шись • (šiś)",
      "name": "head"
    }
  ],
  "lang": "Moksha",
  "lang_code": "mdf",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Moksha entries with incorrect language header",
        "Moksha non-lemma forms",
        "Moksha noun forms",
        "Moksha terms suffixed with -сь",
        "Moksha terms with usage examples"
      ],
      "examples": [
        {
          "english": "What day is today?",
          "ref": "O. Je. Poljakov (1993) Russko-mokšanskij razgovornik [Russian-Moksha phrasebook], Saransk: Mordovskoje knižnoje izdatelʹstvo, page 70",
          "roman": "Kodama ťači šiś ?",
          "text": "Кодама тячи шись?",
          "type": "example"
        }
      ],
      "form_of": [
        {
          "extra": "(ši); the day",
          "word": "ши"
        }
      ],
      "glosses": [
        "definite singular nominative of ши (ši); the day"
      ],
      "links": [
        [
          "ши",
          "ши#Moksha"
        ]
      ],
      "tags": [
        "definite",
        "form-of",
        "nominative",
        "singular"
      ]
    }
  ],
  "word": "шись"
}