"оуста" meaning in Old Church Slavonic

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "bg",
            "2": "уста"
          },
          "expansion": "Bulgarian: уста (usta)",
          "name": "desc"
        }
      ],
      "text": "Bulgarian: уста (usta)"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "cu",
        "2": "sla-pro",
        "3": "*usta"
      },
      "expansion": "Proto-Slavic *usta",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *usta.",
  "forms": [
    {
      "form": "usta",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cu",
        "2": "noun",
        "g": "n-p",
        "g2": "",
        "g3": "",
        "head": "",
        "sc": "",
        "tr": ""
      },
      "expansion": "оуста • (usta) n pl",
      "name": "head"
    },
    {
      "args": {
        "1": "n-p"
      },
      "expansion": "оуста • (usta) n pl",
      "name": "cu-noun"
    }
  ],
  "lang": "Old Church Slavonic",
  "lang_code": "cu",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Church Slavonic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Old Church Slavonic pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "cu",
          "name": "Anatomy",
          "orig": "cu:Anatomy",
          "parents": [
            "Biology",
            "Medicine",
            "Sciences",
            "Healthcare",
            "All topics",
            "Health",
            "Fundamental",
            "Body"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "mouth"
      ],
      "id": "en-оуста-cu-noun-TPNc-HQ1",
      "links": [
        [
          "mouth",
          "mouth"
        ]
      ],
      "raw_glosses": [
        "(plural only) mouth"
      ],
      "related": [
        {
          "roman": "ustĭ",
          "word": "оусть"
        },
        {
          "roman": "čeljustĭ",
          "word": "челюсть"
        }
      ],
      "tags": [
        "plural",
        "plural-only"
      ]
    }
  ],
  "word": "оуста"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "bg",
            "2": "уста"
          },
          "expansion": "Bulgarian: уста (usta)",
          "name": "desc"
        }
      ],
      "text": "Bulgarian: уста (usta)"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "cu",
        "2": "sla-pro",
        "3": "*usta"
      },
      "expansion": "Proto-Slavic *usta",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *usta.",
  "forms": [
    {
      "form": "usta",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cu",
        "2": "noun",
        "g": "n-p",
        "g2": "",
        "g3": "",
        "head": "",
        "sc": "",
        "tr": ""
      },
      "expansion": "оуста • (usta) n pl",
      "name": "head"
    },
    {
      "args": {
        "1": "n-p"
      },
      "expansion": "оуста • (usta) n pl",
      "name": "cu-noun"
    }
  ],
  "lang": "Old Church Slavonic",
  "lang_code": "cu",
  "pos": "noun",
  "related": [
    {
      "roman": "ustĭ",
      "word": "оусть"
    },
    {
      "roman": "čeljustĭ",
      "word": "челюсть"
    }
  ],
  "senses": [
    {
      "categories": [
        "Old Church Slavonic entries with incorrect language header",
        "Old Church Slavonic lemmas",
        "Old Church Slavonic neuter nouns",
        "Old Church Slavonic nouns",
        "Old Church Slavonic pluralia tantum",
        "Old Church Slavonic terms derived from Proto-Slavic",
        "Old Church Slavonic terms inherited from Proto-Slavic",
        "Pages with 1 entry",
        "Pages with entries",
        "cu:Anatomy"
      ],
      "glosses": [
        "mouth"
      ],
      "links": [
        [
          "mouth",
          "mouth"
        ]
      ],
      "raw_glosses": [
        "(plural only) mouth"
      ],
      "tags": [
        "plural",
        "plural-only"
      ]
    }
  ],
  "word": "оуста"
}