"double possessive" meaning in English

{
  "forms": [
    {
      "form": "double possessives",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double possessive (plural double possessives)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Grammar",
          "orig": "en:Grammar",
          "parents": [
            "Linguistics",
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "58 42",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Two or more consecutive nouns in the possessive case, as with \"St. Paul's Cathedral's vergers\"; discouraged on grounds of style."
      ],
      "id": "en-double_possessive-en-noun-nulCFwrG",
      "links": [
        [
          "grammar",
          "grammar"
        ]
      ],
      "raw_glosses": [
        "(grammar) Two or more consecutive nouns in the possessive case, as with \"St. Paul's Cathedral's vergers\"; discouraged on grounds of style."
      ],
      "topics": [
        "grammar",
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    },
    {
      "glosses": [
        "Combination of the periphrastic possessive, \"of x\" with the possessive inflection of a noun. For example, \"A friend of John's\"."
      ],
      "id": "en-double_possessive-en-noun-h6lsHCvH"
    }
  ],
  "sounds": [
    {
      "rhymes": "-ɛsɪv"
    }
  ],
  "word": "double possessive"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "Rhymes:English/ɛsɪv",
    "Rhymes:English/ɛsɪv/5 syllables"
  ],
  "forms": [
    {
      "form": "double possessives",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double possessive (plural double possessives)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "en:Grammar"
      ],
      "glosses": [
        "Two or more consecutive nouns in the possessive case, as with \"St. Paul's Cathedral's vergers\"; discouraged on grounds of style."
      ],
      "links": [
        [
          "grammar",
          "grammar"
        ]
      ],
      "raw_glosses": [
        "(grammar) Two or more consecutive nouns in the possessive case, as with \"St. Paul's Cathedral's vergers\"; discouraged on grounds of style."
      ],
      "topics": [
        "grammar",
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    },
    {
      "glosses": [
        "Combination of the periphrastic possessive, \"of x\" with the possessive inflection of a noun. For example, \"A friend of John's\"."
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-ɛsɪv"
    }
  ],
  "word": "double possessive"
}