"black rent" meaning in English

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  "lang_code": "en",
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          "ref": "1856, “Notes on Old Irish Maps”, in Ulster Journal of Archaeology, volume 4, page 121:",
          "text": "[F]rom whose rich domains in Meath he received a “black rent” equivalent to £10,000 a year[.]",
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        }
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      "glosses": [
        "Blackmail (rent paid in corn, meat, or the lowest coin)."
      ],
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        "(dated) Blackmail (rent paid in corn, meat, or the lowest coin)."
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          "ref": "1825, Edward O’Reilly, “An Essay on the Subject Proposed by the Royal Irish Academy”, in The Transactions of the Royal Irish Academy, volume 14, page 160:",
          "text": "[N]othing could have preserved them from total extirpation but the assistance afforded them by the other Irish princes and tribes, whose friendship and protection they purchased by paying them a tribute, or black rent, as it was called.",
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          "ref": "1831, Edmond O’Foelin, “Eman Oge: A Translation from an Original Irish Story”, in The National Magazine, volume 2, number 3, page 289:",
          "text": "[S]he pays me the black rent, and I let her alone[.]",
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      "glosses": [
        "Protection money."
      ],
      "id": "en-black_rent-en-noun-bzz9BrUy",
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          "protection money"
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      "qualifier": "Scottish Borders",
      "raw_glosses": [
        "(Scottish Borders, Ireland, historical) Protection money."
      ],
      "tags": [
        "Ireland",
        "historical",
        "uncountable"
      ]
    }
  ],
  "word": "black rent"
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          "ref": "1856, “Notes on Old Irish Maps”, in Ulster Journal of Archaeology, volume 4, page 121:",
          "text": "[F]rom whose rich domains in Meath he received a “black rent” equivalent to £10,000 a year[.]",
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        }
      ],
      "glosses": [
        "Blackmail (rent paid in corn, meat, or the lowest coin)."
      ],
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        "(dated) Blackmail (rent paid in corn, meat, or the lowest coin)."
      ],
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          "ref": "1825, Edward O’Reilly, “An Essay on the Subject Proposed by the Royal Irish Academy”, in The Transactions of the Royal Irish Academy, volume 14, page 160:",
          "text": "[N]othing could have preserved them from total extirpation but the assistance afforded them by the other Irish princes and tribes, whose friendship and protection they purchased by paying them a tribute, or black rent, as it was called.",
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          "ref": "1831, Edmond O’Foelin, “Eman Oge: A Translation from an Original Irish Story”, in The National Magazine, volume 2, number 3, page 289:",
          "text": "[S]he pays me the black rent, and I let her alone[.]",
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      ],
      "glosses": [
        "Protection money."
      ],
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