"black as coal" meaning in English

{
  "antonyms": [
    {
      "word": "white as snow"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "enm",
        "3": "blak as cole"
      },
      "expansion": "Middle English blak as cole",
      "name": "inh"
    }
  ],
  "etymology_text": "From Middle English blak as cole.",
  "forms": [
    {
      "form": "as black as coal",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "head": "as black as coal"
      },
      "expansion": "as black as coal (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "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": "topical",
          "langcode": "en",
          "name": "Blacks",
          "orig": "en:Blacks",
          "parents": [
            "Colors",
            "Light",
            "Vision",
            "Energy",
            "Senses",
            "Nature",
            "Perception",
            "All topics",
            "Body",
            "Fundamental",
            "Human"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "coal black"
        }
      ],
      "examples": [
        {
          "ref": "1966, The Rolling Stones (lyrics and music), “Paint It, Black”, in Aftermath",
          "text": "I wanna see it painted / painted black / black as night / black as coal",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Completely black."
      ],
      "id": "en-black_as_coal-en-adj-5Ckg83HF",
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Completely black."
      ],
      "synonyms": [
        {
          "word": "pitch-black"
        },
        {
          "word": "black as tar"
        },
        {
          "word": "black"
        }
      ],
      "tags": [
        "not-comparable"
      ],
      "translations": [
        {
          "code": "hi",
          "lang": "Hindi",
          "roman": "koyle jaisā kālā",
          "sense": "completely black",
          "word": "कोयले जैसा काला"
        },
        {
          "code": "sh",
          "lang": "Serbo-Croatian",
          "sense": "completely black",
          "tags": [
            "Cyrillic"
          ],
          "word": "црн као угљен"
        },
        {
          "code": "sh",
          "lang": "Serbo-Croatian",
          "sense": "completely black",
          "tags": [
            "Roman"
          ],
          "word": "crn kao ugljen"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-black as coal.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/4/44/En-au-black_as_coal.ogg/En-au-black_as_coal.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/4/44/En-au-black_as_coal.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "black as coal"
}

{
  "antonyms": [
    {
      "word": "white as snow"
    }
  ],
  "derived": [
    {
      "word": "coal black"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "enm",
        "3": "blak as cole"
      },
      "expansion": "Middle English blak as cole",
      "name": "inh"
    }
  ],
  "etymology_text": "From Middle English blak as cole.",
  "forms": [
    {
      "form": "as black as coal",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "head": "as black as coal"
      },
      "expansion": "as black as coal (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English similes",
        "English terms derived from Middle English",
        "English terms inherited from Middle English",
        "English terms with audio links",
        "English terms with quotations",
        "English uncomparable adjectives",
        "en:Blacks"
      ],
      "examples": [
        {
          "ref": "1966, The Rolling Stones (lyrics and music), “Paint It, Black”, in Aftermath",
          "text": "I wanna see it painted / painted black / black as night / black as coal",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Completely black."
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Completely black."
      ],
      "synonyms": [
        {
          "word": "pitch-black"
        },
        {
          "word": "black as tar"
        }
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-black as coal.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/4/44/En-au-black_as_coal.ogg/En-au-black_as_coal.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/4/44/En-au-black_as_coal.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "synonyms": [
    {
      "word": "black"
    }
  ],
  "translations": [
    {
      "code": "hi",
      "lang": "Hindi",
      "roman": "koyle jaisā kālā",
      "sense": "completely black",
      "word": "कोयले जैसा काला"
    },
    {
      "code": "sh",
      "lang": "Serbo-Croatian",
      "sense": "completely black",
      "tags": [
        "Cyrillic"
      ],
      "word": "црн као угљен"
    },
    {
      "code": "sh",
      "lang": "Serbo-Croatian",
      "sense": "completely black",
      "tags": [
        "Roman"
      ],
      "word": "crn kao ugljen"
    }
  ],
  "word": "black as coal"
}