"dead as a dodo" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
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      "expansion": "dead as a dodo (not comparable)",
      "name": "en-adj"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English similes",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "94 6",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Undoubtedly and unquestionably dead."
      ],
      "id": "en-dead_as_a_dodo-en-adj-bLctNuoX",
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Undoubtedly and unquestionably dead."
      ],
      "related": [
        {
          "_dis1": "98 2",
          "word": "go the way of the dodo"
        },
        {
          "_dis1": "98 2",
          "word": "go the way of the dodo bird"
        }
      ],
      "tags": [
        "not-comparable"
      ],
      "translations": [
        {
          "_dis1": "93 7",
          "code": "nl",
          "lang": "Dutch",
          "sense": "unquestionably dead",
          "word": "morsdood"
        },
        {
          "_dis1": "93 7",
          "code": "fr",
          "lang": "French",
          "sense": "unquestionably dead",
          "word": "aussi mort qu’un dodo"
        },
        {
          "_dis1": "93 7",
          "code": "de",
          "lang": "German",
          "sense": "unquestionably dead",
          "word": "mausetot"
        },
        {
          "_dis1": "93 7",
          "code": "is",
          "lang": "Icelandic",
          "sense": "unquestionably dead",
          "tags": [
            "masculine"
          ],
          "word": "steindauður"
        },
        {
          "_dis1": "93 7",
          "code": "mi",
          "lang": "Maori",
          "sense": "unquestionably dead",
          "word": "mate ā moa"
        },
        {
          "_dis1": "93 7",
          "code": "sv",
          "lang": "Swedish",
          "sense": "unquestionably dead",
          "word": "stendöd"
        },
        {
          "_dis1": "93 7",
          "code": "sv",
          "lang": "Swedish",
          "sense": "unquestionably dead",
          "word": "död som en sill"
        }
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "English similes",
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      ],
      "glosses": [
        "Very much out of date."
      ],
      "id": "en-dead_as_a_dodo-en-adj-Rsm3McYg",
      "links": [
        [
          "out of date",
          "out of date"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Very much out of date."
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-dead as a dodo.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/0/00/En-au-dead_as_a_dodo.ogg/En-au-dead_as_a_dodo.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/0/00/En-au-dead_as_a_dodo.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "dead as a dodo"
}

{
  "categories": [
    "English adjectives",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English terms with audio links",
    "English uncomparable adjectives"
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "dead as a dodo (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "go the way of the dodo"
    },
    {
      "word": "go the way of the dodo bird"
    }
  ],
  "senses": [
    {
      "categories": [
        "English similes"
      ],
      "glosses": [
        "Undoubtedly and unquestionably dead."
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Undoubtedly and unquestionably dead."
      ],
      "tags": [
        "not-comparable"
      ]
    },
    {
      "categories": [
        "English similes"
      ],
      "glosses": [
        "Very much out of date."
      ],
      "links": [
        [
          "out of date",
          "out of date"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Very much out of date."
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-dead as a dodo.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/0/00/En-au-dead_as_a_dodo.ogg/En-au-dead_as_a_dodo.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/0/00/En-au-dead_as_a_dodo.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "translations": [
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "unquestionably dead",
      "word": "morsdood"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "unquestionably dead",
      "word": "aussi mort qu’un dodo"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "unquestionably dead",
      "word": "mausetot"
    },
    {
      "code": "is",
      "lang": "Icelandic",
      "sense": "unquestionably dead",
      "tags": [
        "masculine"
      ],
      "word": "steindauður"
    },
    {
      "code": "mi",
      "lang": "Maori",
      "sense": "unquestionably dead",
      "word": "mate ā moa"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "unquestionably dead",
      "word": "stendöd"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "unquestionably dead",
      "word": "död som en sill"
    }
  ],
  "word": "dead as a dodo"
}