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Definition of Double possessive
1. Noun. (grammar) Two or more consecutive nouns in the possessive case, as with "St. Paul's Cathedral's vergers"; discouraged on grounds of style. ¹
2. Noun. Combination of the periphrastic possessive, "of ''x''" with the possessive inflection of a noun. For example, "A friend of John's". ¹
¹ Source: wiktionary.com