"dusky shark" meaning in English

{
  "forms": [
    {
      "form": "dusky sharks",
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        "plural"
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      "expansion": "dusky shark (plural dusky sharks)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Carcharhiniform sharks",
          "orig": "en:Carcharhiniform sharks",
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      "glosses": [
        "A requiem shark of species Carcharhinus obscurus, found in tropical and warm-temperate continental seas worldwide."
      ],
      "id": "en-dusky_shark-en-noun-aUOsh5WE",
      "links": [
        [
          "requiem shark",
          "requiem shark"
        ]
      ]
    }
  ],
  "word": "dusky shark"
}

{
  "forms": [
    {
      "form": "dusky sharks",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "dusky shark (plural dusky sharks)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Carcharhiniform sharks"
      ],
      "glosses": [
        "A requiem shark of species Carcharhinus obscurus, found in tropical and warm-temperate continental seas worldwide."
      ],
      "links": [
        [
          "requiem shark",
          "requiem shark"
        ]
      ]
    }
  ],
  "word": "dusky shark"
}