"slough shark" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "slough",
        "3": "shark"
      },
      "expansion": "slough + shark",
      "name": "compound"
    }
  ],
  "etymology_text": "From slough + shark.",
  "forms": [
    {
      "form": "slough sharks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "slough shark (plural slough sharks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Canadian Prairies English",
          "parents": [],
          "source": "w"
        },
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Pikes (fish)",
          "orig": "en:Pikes (fish)",
          "parents": [
            "Fish",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "northern pike"
      ],
      "id": "en-slough_shark-en-noun--4G~qdlm",
      "links": [
        [
          "northern pike",
          "northern pike"
        ]
      ],
      "raw_glosses": [
        "(Canadian Prairies, slang, humurous) northern pike"
      ],
      "tags": [
        "Canadian-Prairies",
        "error-misspelling",
        "humorous",
        "slang"
      ]
    }
  ],
  "word": "slough shark"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "slough",
        "3": "shark"
      },
      "expansion": "slough + shark",
      "name": "compound"
    }
  ],
  "etymology_text": "From slough + shark.",
  "forms": [
    {
      "form": "slough sharks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "slough shark (plural slough sharks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Canadian Prairies English",
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
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        "English multiword terms",
        "English nouns",
        "English slang",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Pikes (fish)"
      ],
      "glosses": [
        "northern pike"
      ],
      "links": [
        [
          "northern pike",
          "northern pike"
        ]
      ],
      "raw_glosses": [
        "(Canadian Prairies, slang, humurous) northern pike"
      ],
      "tags": [
        "Canadian-Prairies",
        "error-misspelling",
        "humorous",
        "slang"
      ]
    }
  ],
  "word": "slough shark"
}