"girl Friday" meaning in English

{
  "etymology_text": "By extension from man Friday, from the character Friday in Robinson Crusoe (1719) by Daniel Defoe",
  "forms": [
    {
      "form": "girl Fridays",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "girls Friday",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "s",
        "2": "girls Friday"
      },
      "expansion": "girl Friday (plural girl Fridays or girls Friday)",
      "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"
        }
      ],
      "glosses": [
        "A right-hand woman."
      ],
      "id": "en-girl_Friday-en-noun-cvWGUdgp",
      "links": [
        [
          "right-hand woman",
          "right-hand woman"
        ]
      ],
      "related": [
        {
          "word": "man Friday"
        }
      ],
      "synonyms": [
        {
          "word": "Girl Friday"
        },
        {
          "word": "girl friday"
        }
      ],
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "Translations",
          "word": "grouille"
        }
      ],
      "wikipedia": [
        "Daniel Defoe",
        "Friday (Robinson Crusoe)",
        "Robinson Crusoe"
      ]
    }
  ],
  "word": "girl Friday"
}

{
  "etymology_text": "By extension from man Friday, from the character Friday in Robinson Crusoe (1719) by Daniel Defoe",
  "forms": [
    {
      "form": "girl Fridays",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "girls Friday",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "s",
        "2": "girls Friday"
      },
      "expansion": "girl Friday (plural girl Fridays or girls Friday)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "man Friday"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Translation table header lacks gloss",
        "en:Female people"
      ],
      "glosses": [
        "A right-hand woman."
      ],
      "links": [
        [
          "right-hand woman",
          "right-hand woman"
        ]
      ],
      "wikipedia": [
        "Daniel Defoe",
        "Friday (Robinson Crusoe)",
        "Robinson Crusoe"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Girl Friday"
    },
    {
      "word": "girl friday"
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "Translations",
      "word": "grouille"
    }
  ],
  "word": "girl Friday"
}