"níbu" meaning in Old Irish

{
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "ní",
        "3": "ba"
      },
      "expansion": "ní + ba",
      "name": "af"
    }
  ],
  "etymology_text": "ní + ba",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "níbu",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "also nníbu after a proclitic",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "ending in a vowel",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "verb form",
        "3": "",
        "head": ""
      },
      "expansion": "níbu",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "níbu",
      "name": "sga-verb form"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "That is, they used to say that it was their own strength that produced victory for them, not God",
          "text": "Is ed as·bertis b⟨a⟩ a nert fadesin imme·ḟolnged choscur doib, níbu Día.",
          "type": "example"
        },
        {
          "english": "It was not a wonder that a god would be made of the stone.",
          "text": "Níbu machdath do·rónta día dind lïac.",
          "type": "example"
        }
      ],
      "form_of": [
        {
          "word": "is"
        }
      ],
      "glosses": [
        "third-person singular past indicative negative of is"
      ],
      "id": "en-níbu-sga-verb-VuUEzZ9X",
      "links": [
        [
          "is",
          "is#Old_Irish"
        ]
      ],
      "tags": [
        "form-of",
        "indicative",
        "negative",
        "past",
        "singular",
        "third-person"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈn͈ʲiːbu/"
    }
  ],
  "word": "níbu"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "ní",
        "3": "ba"
      },
      "expansion": "ní + ba",
      "name": "af"
    }
  ],
  "etymology_text": "ní + ba",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "níbu",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "also nníbu after a proclitic",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "ending in a vowel",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "verb form",
        "3": "",
        "head": ""
      },
      "expansion": "níbu",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "níbu",
      "name": "sga-verb form"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Old Irish compound terms",
        "Old Irish entries with incorrect language header",
        "Old Irish non-lemma forms",
        "Old Irish terms with quotations",
        "Old Irish verb forms",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "english": "That is, they used to say that it was their own strength that produced victory for them, not God",
          "text": "Is ed as·bertis b⟨a⟩ a nert fadesin imme·ḟolnged choscur doib, níbu Día.",
          "type": "example"
        },
        {
          "english": "It was not a wonder that a god would be made of the stone.",
          "text": "Níbu machdath do·rónta día dind lïac.",
          "type": "example"
        }
      ],
      "form_of": [
        {
          "word": "is"
        }
      ],
      "glosses": [
        "third-person singular past indicative negative of is"
      ],
      "links": [
        [
          "is",
          "is#Old_Irish"
        ]
      ],
      "tags": [
        "form-of",
        "indicative",
        "negative",
        "past",
        "singular",
        "third-person"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈn͈ʲiːbu/"
    }
  ],
  "word": "níbu"
}

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

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

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