"immurgu" meaning in Old Irish

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "mga",
            "2": "immorro"
          },
          "expansion": "Middle Irish: immorro, immurgu (archaic)\nIrish: iomorra",
          "name": "desctree"
        }
      ],
      "text": "Middle Irish: immorro, immurgu (archaic)\nIrish: iomorra"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "cel-pro",
        "3": "",
        "alt": "*ambi-ɸro-gusom",
        "nocat": "1"
      },
      "expansion": "Proto-Celtic *ambi-ɸro-gusom",
      "name": "der"
    },
    {
      "args": {
        "1": "sga",
        "2": "imm-",
        "3": "rogu",
        "nocat": "1",
        "t1": "around",
        "t2": "choice"
      },
      "expansion": "imm- (“around”) + rogu (“choice”)",
      "name": "af"
    }
  ],
  "etymology_text": "Thurneysen suggests it may be from imm- (intensive prefix) + ro- (“very”) + gáu (“untruth”), which seems unlikely both formally and semantically.\nStüber proposes another etymology from virtual Proto-Celtic *ambi-ɸro-gusom, i.e. imm- (“around”) + rogu (“choice”), but also struggles to provide a semantic derivation.",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "adverb",
        "3": "never the first word in its clause"
      },
      "expansion": "immurgu (never the first word in its clause)",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "adv",
  "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 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "camaiph immurgu"
        }
      ],
      "glosses": [
        "however, nevertheless"
      ],
      "head_nr": 1,
      "id": "en-immurgu-sga-adv-3ZwMchZd",
      "links": [
        [
          "however",
          "however"
        ],
        [
          "nevertheless",
          "nevertheless"
        ]
      ],
      "synonyms": [
        {
          "word": "cammaiph"
        },
        {
          "word": "immargu"
        },
        {
          "word": "imurgu"
        },
        {
          "word": "im̅"
        },
        {
          "tags": [
            "abbreviation"
          ],
          "word": "im̅r"
        }
      ],
      "wikipedia": [
        "D. A. Binchy",
        "Osborn Bergin"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/iˈmurɣu/"
    }
  ],
  "word": "immurgu"
}

{
  "derived": [
    {
      "word": "camaiph immurgu"
    }
  ],
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "mga",
            "2": "immorro"
          },
          "expansion": "Middle Irish: immorro, immurgu (archaic)\nIrish: iomorra",
          "name": "desctree"
        }
      ],
      "text": "Middle Irish: immorro, immurgu (archaic)\nIrish: iomorra"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "cel-pro",
        "3": "",
        "alt": "*ambi-ɸro-gusom",
        "nocat": "1"
      },
      "expansion": "Proto-Celtic *ambi-ɸro-gusom",
      "name": "der"
    },
    {
      "args": {
        "1": "sga",
        "2": "imm-",
        "3": "rogu",
        "nocat": "1",
        "t1": "around",
        "t2": "choice"
      },
      "expansion": "imm- (“around”) + rogu (“choice”)",
      "name": "af"
    }
  ],
  "etymology_text": "Thurneysen suggests it may be from imm- (intensive prefix) + ro- (“very”) + gáu (“untruth”), which seems unlikely both formally and semantically.\nStüber proposes another etymology from virtual Proto-Celtic *ambi-ɸro-gusom, i.e. imm- (“around”) + rogu (“choice”), but also struggles to provide a semantic derivation.",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "adverb",
        "3": "never the first word in its clause"
      },
      "expansion": "immurgu (never the first word in its clause)",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Old Irish adverbs",
        "Old Irish entries with incorrect language header",
        "Old Irish lemmas",
        "Pages with 2 entries",
        "Pages with entries"
      ],
      "glosses": [
        "however, nevertheless"
      ],
      "head_nr": 1,
      "links": [
        [
          "however",
          "however"
        ],
        [
          "nevertheless",
          "nevertheless"
        ]
      ],
      "wikipedia": [
        "D. A. Binchy",
        "Osborn Bergin"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/iˈmurɣu/"
    }
  ],
  "synonyms": [
    {
      "word": "cammaiph"
    },
    {
      "word": "immargu"
    },
    {
      "word": "imurgu"
    },
    {
      "word": "im̅"
    },
    {
      "tags": [
        "abbreviation"
      ],
      "word": "im̅r"
    }
  ],
  "word": "immurgu"
}

{
  "called_from": "form_descriptions/1698",
  "msg": "unrecognized head form: never the first word in its clause",
  "path": [
    "immurgu"
  ],
  "section": "Old Irish",
  "subsection": "adverb",
  "title": "immurgu",
  "trace": ""
}

{
  "called_from": "page/1713/20221215",
  "msg": "later head without list of senses,template node #, immurgu/Old Irish",
  "path": [
    "immurgu"
  ],
  "section": "Old Irish",
  "subsection": "adverb",
  "title": "immurgu",
  "trace": ""
}