"weird sister" meaning in English

{
  "forms": [
    {
      "form": "weird sisters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "weird sister (plural weird sisters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Female people",
          "orig": "en:Female people",
          "parents": [
            "Female",
            "People",
            "Gender",
            "Human",
            "Biology",
            "Psychology",
            "Sociology",
            "All topics",
            "Sciences",
            "Social sciences",
            "Fundamental",
            "Society"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Occult",
          "orig": "en:Occult",
          "parents": [
            "Forteana",
            "Religion",
            "Pseudoscience",
            "Culture",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1863, Eclectic Magazine of Foreign Literature, volume 59, page 289",
          "text": "It was some such feeling as this which led Michael to visit a weird sister known as the Witch of Falsehope.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A female witch."
      ],
      "id": "en-weird_sister-en-noun-jtvuchXp",
      "links": [
        [
          "poetic",
          "poetic"
        ],
        [
          "female",
          "female"
        ],
        [
          "witch",
          "witch"
        ]
      ],
      "raw_glosses": [
        "(poetic) A female witch."
      ],
      "tags": [
        "poetic"
      ]
    }
  ],
  "word": "weird sister"
}

{
  "forms": [
    {
      "form": "weird sisters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "weird sister (plural weird sisters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English poetic terms",
        "English terms with quotations",
        "Quotation templates to be cleaned",
        "en:Female people",
        "en:Occult"
      ],
      "examples": [
        {
          "ref": "1863, Eclectic Magazine of Foreign Literature, volume 59, page 289",
          "text": "It was some such feeling as this which led Michael to visit a weird sister known as the Witch of Falsehope.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A female witch."
      ],
      "links": [
        [
          "poetic",
          "poetic"
        ],
        [
          "female",
          "female"
        ],
        [
          "witch",
          "witch"
        ]
      ],
      "raw_glosses": [
        "(poetic) A female witch."
      ],
      "tags": [
        "poetic"
      ]
    }
  ],
  "word": "weird sister"
}