"sleeper shark" meaning in English

{
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        "lit": "sleepy"
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      "name": "clq"
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    {
      "args": {
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        "2": "sleeper",
        "3": "shark",
        "4": ""
      },
      "expansion": "sleeper + shark",
      "name": "compound"
    }
  ],
  "etymology_text": "Calque of translingual Somniosus (literally “sleepy”). From sleeper + shark, referring to their slow, lethargic habits.",
  "forms": [
    {
      "form": "sleeper sharks",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "sleepershark",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sleeper shark (plural sleeper sharks)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "kind": "other",
          "name": "English entries with incorrect language header",
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        },
        {
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          "langcode": "en",
          "name": "Sharks",
          "orig": "en:Sharks",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Any shark of the family Somniosidae."
      ],
      "id": "en-sleeper_shark-en-noun-4lSOLRZg",
      "links": [
        [
          "shark",
          "shark"
        ]
      ]
    }
  ],
  "word": "sleeper shark"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "mul",
        "3": "Somniosus",
        "lit": "sleepy"
      },
      "expansion": "Calque of translingual Somniosus (literally “sleepy”)",
      "name": "clq"
    },
    {
      "args": {
        "1": "en",
        "2": "sleeper",
        "3": "shark",
        "4": ""
      },
      "expansion": "sleeper + shark",
      "name": "compound"
    }
  ],
  "etymology_text": "Calque of translingual Somniosus (literally “sleepy”). From sleeper + shark, referring to their slow, lethargic habits.",
  "forms": [
    {
      "form": "sleeper sharks",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "sleepershark",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "sleeper shark (plural sleeper sharks)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Sharks"
      ],
      "glosses": [
        "Any shark of the family Somniosidae."
      ],
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    }
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  "word": "sleeper shark"
}