"box crab" meaning in English

{
  "etymology_text": "In reference to the bulky carapace.",
  "forms": [
    {
      "form": "box crabs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "box crab (plural box crabs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Crabs",
          "orig": "en:Crabs",
          "parents": [
            "Crustaceans",
            "Decapods",
            "Arthropods",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "lumpy box crab"
        },
        {
          "word": "rough box crab"
        }
      ],
      "glosses": [
        "Any of the crabs of the genus Calappa."
      ],
      "id": "en-box_crab-en-noun-qPF0YuUt",
      "links": [
        [
          "genus",
          "genus"
        ],
        [
          "Calappa",
          "Calappa#Translingual"
        ]
      ],
      "synonyms": [
        {
          "word": "shamefaced crab"
        }
      ]
    }
  ],
  "word": "box crab"
}

{
  "derived": [
    {
      "word": "lumpy box crab"
    },
    {
      "word": "rough box crab"
    }
  ],
  "etymology_text": "In reference to the bulky carapace.",
  "forms": [
    {
      "form": "box crabs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "box crab (plural box crabs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Crabs"
      ],
      "glosses": [
        "Any of the crabs of the genus Calappa."
      ],
      "links": [
        [
          "genus",
          "genus"
        ],
        [
          "Calappa",
          "Calappa#Translingual"
        ]
      ],
      "synonyms": [
        {
          "word": "shamefaced crab"
        }
      ]
    }
  ],
  "word": "box crab"
}