"sure as death" meaning in All languages combined

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "sure as death (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English similes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1896, Margaret Oliphant, The Library Window:",
          "text": "\"It was naething to make a wark about. It was just yon windy yonder in the library that is nae windy. And it was open as sure's death. You may laugh if you like. Is that a' she's wantin' wi' me?\"",
          "type": "quote"
        }
      ],
      "glosses": [
        "Most certainly."
      ],
      "id": "en-sure_as_death-en-adv-JCa4jgzh",
      "links": [
        [
          "certainly",
          "certainly"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Most certainly."
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "sure as death"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "sure as death (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "English adverbs",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English similes",
        "English terms with quotations",
        "English uncomparable adverbs",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1896, Margaret Oliphant, The Library Window:",
          "text": "\"It was naething to make a wark about. It was just yon windy yonder in the library that is nae windy. And it was open as sure's death. You may laugh if you like. Is that a' she's wantin' wi' me?\"",
          "type": "quote"
        }
      ],
      "glosses": [
        "Most certainly."
      ],
      "links": [
        [
          "certainly",
          "certainly"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Most certainly."
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "sure as death"
}