"Mother Thumb and her four daughters" meaning in English

{
  "etymology_text": "The daughters represent the four fingers of the hand.",
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      "expansion": "Mother Thumb and her four daughters",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English coordinated pairs",
          "parents": [
            "Coordinated pairs",
            "Terms by etymology"
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          "source": "w"
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          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
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      ],
      "glosses": [
        "A man's hand, used for masturbation."
      ],
      "id": "en-Mother_Thumb_and_her_four_daughters-en-name-LDwMo3m5",
      "links": [
        [
          "humorous",
          "humorous"
        ],
        [
          "hand",
          "hand"
        ],
        [
          "masturbation",
          "masturbation"
        ]
      ],
      "raw_glosses": [
        "(slang, humorous) A man's hand, used for masturbation."
      ],
      "synonyms": [
        {
          "word": "Rosie Palmer and her five sisters"
        }
      ],
      "tags": [
        "humorous",
        "slang"
      ]
    }
  ],
  "word": "Mother Thumb and her four daughters"
}

{
  "etymology_text": "The daughters represent the four fingers of the hand.",
  "head_templates": [
    {
      "args": {
        "head": "Mother Thumb and her four daughters"
      },
      "expansion": "Mother Thumb and her four daughters",
      "name": "en-prop"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "English coordinated pairs",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English humorous terms",
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        "English multiword terms",
        "English proper nouns",
        "English slang",
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        "English uncountable nouns"
      ],
      "glosses": [
        "A man's hand, used for masturbation."
      ],
      "links": [
        [
          "humorous",
          "humorous"
        ],
        [
          "hand",
          "hand"
        ],
        [
          "masturbation",
          "masturbation"
        ]
      ],
      "raw_glosses": [
        "(slang, humorous) A man's hand, used for masturbation."
      ],
      "synonyms": [
        {
          "word": "Rosie Palmer and her five sisters"
        }
      ],
      "tags": [
        "humorous",
        "slang"
      ]
    }
  ],
  "word": "Mother Thumb and her four daughters"
}