"blue devils" meaning in English

{
  "etymology_text": "Originally apparitions supposed to be seen by sufferers of delirium tremens.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "blue devils pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "76 24",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "88 12",
          "kind": "other",
          "name": "English pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1890, William Morris, News from Nowhere, in the journal The Commonweal. (First published in book form 1890.)",
          "text": "\"[…] the disease is either extinct, or exists in such a mild form that a short course of aperient medicine carries it off. It is sometimes called the Blue-devils now or the Mulleygrubs. Queer names, ain't they?\""
        }
      ],
      "glosses": [
        "low spirits; depression"
      ],
      "id": "en-blue_devils-en-noun-FnjoVPWb",
      "links": [
        [
          "depression",
          "depression"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) low spirits; depression"
      ],
      "synonyms": [
        {
          "_dis1": "96 4",
          "sense": "depression",
          "word": "mulligrubs"
        }
      ],
      "tags": [
        "idiomatic",
        "plural",
        "plural-only"
      ],
      "translations": [
        {
          "_dis1": "94 6",
          "code": "fr",
          "lang": "French",
          "sense": "low spirits",
          "tags": [
            "feminine"
          ],
          "word": "idée noire"
        },
        {
          "_dis1": "94 6",
          "code": "fr",
          "lang": "French",
          "sense": "low spirits",
          "tags": [
            "feminine"
          ],
          "word": "déprime"
        },
        {
          "_dis1": "94 6",
          "code": "pl",
          "lang": "Polish",
          "sense": "low spirits",
          "tags": [
            "masculine"
          ],
          "word": "dołek"
        },
        {
          "_dis1": "94 6",
          "code": "ru",
          "lang": "Russian",
          "note": "зелёная тоска́ f (zeljónaja toská, literally “green melancholy”)",
          "sense": "low spirits"
        },
        {
          "_dis1": "94 6",
          "code": "ru",
          "lang": "Russian",
          "roman": "xandrá",
          "sense": "low spirits",
          "tags": [
            "feminine"
          ],
          "word": "хандра́"
        }
      ]
    },
    {
      "categories": [],
      "glosses": [
        "depressants, especially the barbiturate amobarbital."
      ],
      "id": "en-blue_devils-en-noun-lRlUQE2W",
      "links": [
        [
          "amobarbital",
          "amobarbital"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) depressants, especially the barbiturate amobarbital."
      ],
      "tags": [
        "idiomatic",
        "plural",
        "plural-only"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-blue devils.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/f/fc/En-au-blue_devils.ogg/En-au-blue_devils.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/f/fc/En-au-blue_devils.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "blue devils"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English pluralia tantum",
    "English terms with audio links"
  ],
  "etymology_text": "Originally apparitions supposed to be seen by sufferers of delirium tremens.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "blue devils pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English idioms"
      ],
      "examples": [
        {
          "ref": "1890, William Morris, News from Nowhere, in the journal The Commonweal. (First published in book form 1890.)",
          "text": "\"[…] the disease is either extinct, or exists in such a mild form that a short course of aperient medicine carries it off. It is sometimes called the Blue-devils now or the Mulleygrubs. Queer names, ain't they?\""
        }
      ],
      "glosses": [
        "low spirits; depression"
      ],
      "links": [
        [
          "depression",
          "depression"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) low spirits; depression"
      ],
      "tags": [
        "idiomatic",
        "plural",
        "plural-only"
      ]
    },
    {
      "categories": [
        "English idioms"
      ],
      "glosses": [
        "depressants, especially the barbiturate amobarbital."
      ],
      "links": [
        [
          "amobarbital",
          "amobarbital"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) depressants, especially the barbiturate amobarbital."
      ],
      "tags": [
        "idiomatic",
        "plural",
        "plural-only"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-blue devils.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/f/fc/En-au-blue_devils.ogg/En-au-blue_devils.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/f/fc/En-au-blue_devils.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "synonyms": [
    {
      "sense": "depression",
      "word": "mulligrubs"
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "low spirits",
      "tags": [
        "feminine"
      ],
      "word": "idée noire"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "low spirits",
      "tags": [
        "feminine"
      ],
      "word": "déprime"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "low spirits",
      "tags": [
        "masculine"
      ],
      "word": "dołek"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "note": "зелёная тоска́ f (zeljónaja toská, literally “green melancholy”)",
      "sense": "low spirits"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "xandrá",
      "sense": "low spirits",
      "tags": [
        "feminine"
      ],
      "word": "хандра́"
    }
  ],
  "word": "blue devils"
}