"cossa" meaning in Old Irish

{
  "etymology_number": 1,
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "noun form"
      },
      "expansion": "cossa",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "noun",
  "senses": [
    {
      "form_of": [
        {
          "word": "cos"
        }
      ],
      "glosses": [
        "nominative/vocative/accusative plural of cos"
      ],
      "id": "en-cossa-sga-noun-7bPBaZ5-",
      "links": [
        [
          "cos",
          "cos#Old_Irish"
        ]
      ],
      "tags": [
        "accusative",
        "form-of",
        "nominative",
        "plural",
        "vocative"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈkosa/"
    }
  ],
  "word": "cossa"
}

{
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "co",
        "3": "a",
        "pos2": "neuter accusative singular",
        "t1": "to, toward",
        "t2": "the"
      },
      "expansion": "Univerbation of co (“to, toward”) + a (“the”, neuter accusative singular)",
      "name": "univ"
    }
  ],
  "etymology_text": "Univerbation of co (“to, toward”) + a (“the”, neuter accusative singular)",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "cossa",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "chossa",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "cossa",
      "source": "mutation"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "article form"
      },
      "expansion": "cossa",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "article",
  "senses": [
    {
      "glosses": [
        "to the, toward the (neuter accusative singular)"
      ],
      "id": "en-cossa-sga-article-9O5NF7Bk"
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈkosa/"
    }
  ],
  "word": "cossa"
}

{
  "categories": [
    "Old Irish article forms",
    "Old Irish entries with incorrect language header",
    "Old Irish non-lemma forms",
    "Old Irish noun forms",
    "Old Irish univerbations",
    "Pages with 5 entries",
    "Pages with entries"
  ],
  "etymology_number": 1,
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "noun form"
      },
      "expansion": "cossa",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "noun",
  "senses": [
    {
      "form_of": [
        {
          "word": "cos"
        }
      ],
      "glosses": [
        "nominative/vocative/accusative plural of cos"
      ],
      "links": [
        [
          "cos",
          "cos#Old_Irish"
        ]
      ],
      "tags": [
        "accusative",
        "form-of",
        "nominative",
        "plural",
        "vocative"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈkosa/"
    }
  ],
  "word": "cossa"
}

{
  "categories": [
    "Old Irish article forms",
    "Old Irish entries with incorrect language header",
    "Old Irish non-lemma forms",
    "Old Irish univerbations",
    "Pages with 5 entries",
    "Pages with entries"
  ],
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "co",
        "3": "a",
        "pos2": "neuter accusative singular",
        "t1": "to, toward",
        "t2": "the"
      },
      "expansion": "Univerbation of co (“to, toward”) + a (“the”, neuter accusative singular)",
      "name": "univ"
    }
  ],
  "etymology_text": "Univerbation of co (“to, toward”) + a (“the”, neuter accusative singular)",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "cossa",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "chossa",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "cossa",
      "source": "mutation"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "article form"
      },
      "expansion": "cossa",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "article",
  "senses": [
    {
      "glosses": [
        "to the, toward the (neuter accusative singular)"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈkosa/"
    }
  ],
  "word": "cossa"
}

{
  "called_from": "inflection/865",
  "msg": "inflection table: IF WITHOUT ELSE EVALS False: cossa/Old Irish 'radical' base_tags=set()",
  "path": [
    "cossa"
  ],
  "section": "Old Irish",
  "subsection": "article",
  "title": "cossa",
  "trace": ""
}

{
  "called_from": "inflection/735",
  "msg": "inflection table: unrecognized header: 'lenition'",
  "path": [
    "cossa"
  ],
  "section": "Old Irish",
  "subsection": "article",
  "title": "cossa",
  "trace": ""
}

{
  "called_from": "inflection/735",
  "msg": "inflection table: unrecognized header: 'nasalization'",
  "path": [
    "cossa"
  ],
  "section": "Old Irish",
  "subsection": "article",
  "title": "cossa",
  "trace": ""
}

{
  "called_from": "inflection/1826",
  "msg": "inflection table: empty tags for cossa",
  "path": [
    "cossa"
  ],
  "section": "Old Irish",
  "subsection": "article",
  "title": "cossa",
  "trace": ""
}