"wharf rat" meaning in English

{
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      "expansion": "wharf rat (plural wharf rats)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A brown rat."
      ],
      "id": "en-wharf_rat-en-noun-0CJE1cpf",
      "links": [
        [
          "brown rat",
          "brown rat"
        ]
      ]
    },
    {
      "categories": [],
      "glosses": [
        "A neglected boy who lives around the wharfs."
      ],
      "id": "en-wharf_rat-en-noun-AP2OtIHK",
      "links": [
        [
          "boy",
          "boy"
        ],
        [
          "wharf",
          "wharf"
        ]
      ],
      "raw_glosses": [
        "(slang) A neglected boy who lives around the wharfs."
      ],
      "tags": [
        "slang"
      ]
    },
    {
      "categories": [
        {
          "_dis": "1 29 70",
          "kind": "other",
          "name": "English entries with incorrect language header",
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          "_dis": "2 29 69",
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            "Entry maintenance"
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          "source": "w+disamb"
        },
        {
          "_dis": "6 29 65",
          "kind": "lifeform",
          "langcode": "en",
          "name": "Murids",
          "orig": "en:Murids",
          "parents": [
            "Rodents",
            "Mammals",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A man who hangs around a wharf in the hope of finding temporary work there."
      ],
      "id": "en-wharf_rat-en-noun-J7HzD6t6",
      "links": [
        [
          "temporary",
          "temporary"
        ],
        [
          "work",
          "work"
        ]
      ],
      "raw_glosses": [
        "(slang) A man who hangs around a wharf in the hope of finding temporary work there."
      ],
      "related": [
        {
          "_dis1": "31 19 50",
          "word": "mall rat"
        },
        {
          "_dis1": "31 19 50",
          "word": "rink rat"
        }
      ],
      "tags": [
        "slang"
      ]
    }
  ],
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      "audio": "En-au-wharf rat.ogg",
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  ],
  "word": "wharf rat"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
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    "English lemmas",
    "English multiword terms",
    "English nouns",
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    "en:Murids"
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  "forms": [
    {
      "form": "wharf rats",
      "tags": [
        "plural"
      ]
    }
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  "head_templates": [
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      "expansion": "wharf rat (plural wharf rats)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "mall rat"
    },
    {
      "word": "rink rat"
    }
  ],
  "senses": [
    {
      "glosses": [
        "A brown rat."
      ],
      "links": [
        [
          "brown rat",
          "brown rat"
        ]
      ]
    },
    {
      "categories": [
        "English slang"
      ],
      "glosses": [
        "A neglected boy who lives around the wharfs."
      ],
      "links": [
        [
          "boy",
          "boy"
        ],
        [
          "wharf",
          "wharf"
        ]
      ],
      "raw_glosses": [
        "(slang) A neglected boy who lives around the wharfs."
      ],
      "tags": [
        "slang"
      ]
    },
    {
      "categories": [
        "English slang"
      ],
      "glosses": [
        "A man who hangs around a wharf in the hope of finding temporary work there."
      ],
      "links": [
        [
          "temporary",
          "temporary"
        ],
        [
          "work",
          "work"
        ]
      ],
      "raw_glosses": [
        "(slang) A man who hangs around a wharf in the hope of finding temporary work there."
      ],
      "tags": [
        "slang"
      ]
    }
  ],
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