"black ivory" meaning in English

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      "expansion": "black ivory (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "People",
          "orig": "en:People",
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            "Human",
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            "Fundamental"
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        {
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          "name": "Slaves",
          "orig": "en:Slaves",
          "parents": [
            "Servants",
            "Slavery",
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            "Work",
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            "Human activity",
            "Human",
            "Fundamental",
            "Human behaviour"
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      ],
      "glosses": [
        "Black slaves, regarded as cargo in the slave trade."
      ],
      "id": "en-black_ivory-en-noun-yccmmAn6",
      "links": [
        [
          "Black",
          "black"
        ],
        [
          "slave",
          "slave"
        ],
        [
          "cargo",
          "cargo"
        ],
        [
          "slave trade",
          "slave trade"
        ]
      ],
      "raw_glosses": [
        "(historical, euphemistic) Black slaves, regarded as cargo in the slave trade."
      ],
      "tags": [
        "euphemistic",
        "historical",
        "uncountable"
      ]
    }
  ],
  "word": "black ivory"
}

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      "expansion": "black ivory (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:People",
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      "glosses": [
        "Black slaves, regarded as cargo in the slave trade."
      ],
      "links": [
        [
          "Black",
          "black"
        ],
        [
          "slave",
          "slave"
        ],
        [
          "cargo",
          "cargo"
        ],
        [
          "slave trade",
          "slave trade"
        ]
      ],
      "raw_glosses": [
        "(historical, euphemistic) Black slaves, regarded as cargo in the slave trade."
      ],
      "tags": [
        "euphemistic",
        "historical",
        "uncountable"
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  ],
  "word": "black ivory"
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