"thumb splitter" meaning in English

{
  "etymology_text": "Referring to the powerful claw capable of inflicting deep wounds when handled.",
  "forms": [
    {
      "form": "thumb splitters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "thumb splitter (plural thumb splitters)",
      "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": "Crustaceans",
          "orig": "en:Crustaceans",
          "parents": [
            "Arthropods",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of mantis shrimp."
      ],
      "id": "en-thumb_splitter-en-noun-gdnSS0NL",
      "links": [
        [
          "mantis shrimp",
          "mantis shrimp#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "mantis shrimp"
        }
      ],
      "wikipedia": [
        "thumb splitter"
      ]
    }
  ],
  "word": "thumb splitter"
}

{
  "etymology_text": "Referring to the powerful claw capable of inflicting deep wounds when handled.",
  "forms": [
    {
      "form": "thumb splitters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "thumb splitter (plural thumb splitters)",
      "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:Crustaceans"
      ],
      "glosses": [
        "Synonym of mantis shrimp."
      ],
      "links": [
        [
          "mantis shrimp",
          "mantis shrimp#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "mantis shrimp"
        }
      ],
      "wikipedia": [
        "thumb splitter"
      ]
    }
  ],
  "word": "thumb splitter"
}