"mba'etatá" meaning in Old Tupi

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "yrl",
            "2": "mbaetatá",
            "alts": "1"
          },
          "expansion": "Nheengatu: mbaetatá",
          "name": "desc"
        }
      ],
      "text": "Nheengatu: mbaetatá"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "pt",
            "2": "boitatá",
            "alts": "1",
            "bor": "1"
          },
          "expansion": "→ Portuguese: boitatá, baitatá, batatá, biatatá, bata, batatão",
          "name": "desc"
        }
      ],
      "text": "→ Portuguese: boitatá, baitatá, batatá, biatatá, bata, batatão"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "tpw",
        "2": "mba'e",
        "3": "tatá",
        "t1": "thing",
        "t2": "fire"
      },
      "expansion": "mba'e (“thing”) + tatá (“fire”)",
      "name": "af"
    }
  ],
  "etymology_text": "From mba'e (“thing”) + tatá (“fire”).",
  "head_templates": [
    {
      "args": {
        "1": "tpw",
        "10": "",
        "11": "",
        "12": "",
        "13": "",
        "14": "o emba'etatá",
        "15": "",
        "16": "",
        "17": "",
        "18": "",
        "2": "noun",
        "3": "?",
        "4": "",
        "5": "",
        "6": "",
        "7": "",
        "8": "",
        "9": "",
        "cat2": "",
        "cat3": "nouns",
        "cat4": "",
        "head": ""
      },
      "expansion": "mba'etatá (?)",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "mba'etatá (?)",
      "name": "tpw-noun"
    }
  ],
  "hyphenation": [
    "mba‧'e‧ta‧tá"
  ],
  "lang": "Old Tupi",
  "lang_code": "tpw",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Tupi 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"
        },
        {
          "kind": "topical",
          "langcode": "tpw",
          "name": "Tupi mythology",
          "orig": "tpw:Tupi mythology",
          "parents": [
            "Mythology",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "will o' the wisp"
      ],
      "id": "en-mba'etatá-tpw-noun-SWJvOStG",
      "links": [
        [
          "will o' the wisp",
          "will o' the wisp"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ᵐbaˌʔɛ.taˈta/"
    },
    {
      "rhymes": "-a"
    }
  ],
  "word": "mba'etatá"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "yrl",
            "2": "mbaetatá",
            "alts": "1"
          },
          "expansion": "Nheengatu: mbaetatá",
          "name": "desc"
        }
      ],
      "text": "Nheengatu: mbaetatá"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "pt",
            "2": "boitatá",
            "alts": "1",
            "bor": "1"
          },
          "expansion": "→ Portuguese: boitatá, baitatá, batatá, biatatá, bata, batatão",
          "name": "desc"
        }
      ],
      "text": "→ Portuguese: boitatá, baitatá, batatá, biatatá, bata, batatão"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "tpw",
        "2": "mba'e",
        "3": "tatá",
        "t1": "thing",
        "t2": "fire"
      },
      "expansion": "mba'e (“thing”) + tatá (“fire”)",
      "name": "af"
    }
  ],
  "etymology_text": "From mba'e (“thing”) + tatá (“fire”).",
  "head_templates": [
    {
      "args": {
        "1": "tpw",
        "10": "",
        "11": "",
        "12": "",
        "13": "",
        "14": "o emba'etatá",
        "15": "",
        "16": "",
        "17": "",
        "18": "",
        "2": "noun",
        "3": "?",
        "4": "",
        "5": "",
        "6": "",
        "7": "",
        "8": "",
        "9": "",
        "cat2": "",
        "cat3": "nouns",
        "cat4": "",
        "head": ""
      },
      "expansion": "mba'etatá (?)",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "mba'etatá (?)",
      "name": "tpw-noun"
    }
  ],
  "hyphenation": [
    "mba‧'e‧ta‧tá"
  ],
  "lang": "Old Tupi",
  "lang_code": "tpw",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Old Tupi compound terms",
        "Old Tupi entries with incorrect language header",
        "Old Tupi lemmas",
        "Old Tupi nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "Rhymes:Old Tupi/a",
        "Rhymes:Old Tupi/a/4 syllables",
        "tpw:Tupi mythology"
      ],
      "glosses": [
        "will o' the wisp"
      ],
      "links": [
        [
          "will o' the wisp",
          "will o' the wisp"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ᵐbaˌʔɛ.taˈta/"
    },
    {
      "rhymes": "-a"
    }
  ],
  "word": "mba'etatá"
}

{
  "called_from": "form_descriptions/1698",
  "msg": "unrecognized head form: ?",
  "path": [
    "mba'etatá"
  ],
  "section": "Old Tupi",
  "subsection": "noun",
  "title": "mba'etatá",
  "trace": ""
}