"Darwin's Bulldog" meaning in English

{
  "etymology_text": "From a comparison the English biologist Huxley made between himself and the bulldog, since they are both ferocious fighters (the bulldog fights with spirit to win fights, and Huxley fought with spirit in defense of evolution).",
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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          "name": "Individuals",
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        {
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          "langcode": "en",
          "name": "Nicknames of individuals",
          "orig": "en:Nicknames of individuals",
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      "glosses": [
        "Thomas Henry Huxley."
      ],
      "id": "en-Darwin's_Bulldog-en-name-Hvsgj147",
      "related": [
        {
          "word": "Darwin"
        }
      ]
    }
  ],
  "word": "Darwin's Bulldog"
}

{
  "etymology_text": "From a comparison the English biologist Huxley made between himself and the bulldog, since they are both ferocious fighters (the bulldog fights with spirit to win fights, and Huxley fought with spirit in defense of evolution).",
  "head_templates": [
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      "name": "en-proper noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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    {
      "word": "Darwin"
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  ],
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        "en:Nicknames of individuals"
      ],
      "glosses": [
        "Thomas Henry Huxley."
      ]
    }
  ],
  "word": "Darwin's Bulldog"
}