"batar" meaning in Old Irish

{
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "verb form"
      },
      "expansion": "batar",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "_dis": "51 49",
          "kind": "other",
          "name": "Old Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "third-person plural preterite/imperfect indicative of is"
      ],
      "id": "en-batar-sga-verb-4mPU4A4Y",
      "links": [
        [
          "is",
          "is#Old Irish"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "51 49",
          "kind": "other",
          "name": "Old Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "third-person plural preterite/imperfect indicative relative of is"
      ],
      "id": "en-batar-sga-verb-EG4Qopnh",
      "links": [
        [
          "is",
          "is#Old Irish"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "_dis1": "51 49",
      "sense": "nonrelative only",
      "word": "batir"
    }
  ],
  "word": "batar"
}

{
  "categories": [
    "Old Irish entries with incorrect language header",
    "Old Irish non-lemma forms",
    "Old Irish verb forms"
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "verb form"
      },
      "expansion": "batar",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "verb",
  "senses": [
    {
      "glosses": [
        "third-person plural preterite/imperfect indicative of is"
      ],
      "links": [
        [
          "is",
          "is#Old Irish"
        ]
      ]
    },
    {
      "glosses": [
        "third-person plural preterite/imperfect indicative relative of is"
      ],
      "links": [
        [
          "is",
          "is#Old Irish"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "nonrelative only",
      "word": "batir"
    }
  ],
  "word": "batar"
}