"bluff catcher" meaning in English

{
  "forms": [
    {
      "form": "bluff catchers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bluff catcher (plural bluff catchers)",
      "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": "topical",
          "langcode": "en",
          "name": "Poker",
          "orig": "en:Poker",
          "parents": [
            "Card games",
            "Gambling",
            "Games",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "On such a coordinated board, queens are basically a bluff catcher.",
          "type": "example"
        }
      ],
      "glosses": [
        "A hand which can beat a bluff but not any hand better than a bluff."
      ],
      "id": "en-bluff_catcher-en-noun-TDqWorgN",
      "links": [
        [
          "poker",
          "poker"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "bluff",
          "bluff"
        ]
      ],
      "raw_glosses": [
        "(poker slang) A hand which can beat a bluff but not any hand better than a bluff."
      ],
      "tags": [
        "slang"
      ],
      "topics": [
        "card-games",
        "poker"
      ]
    }
  ],
  "word": "bluff catcher"
}

{
  "forms": [
    {
      "form": "bluff catchers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bluff catcher (plural bluff catchers)",
      "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",
        "English terms with usage examples",
        "en:Poker"
      ],
      "examples": [
        {
          "text": "On such a coordinated board, queens are basically a bluff catcher.",
          "type": "example"
        }
      ],
      "glosses": [
        "A hand which can beat a bluff but not any hand better than a bluff."
      ],
      "links": [
        [
          "poker",
          "poker"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "bluff",
          "bluff"
        ]
      ],
      "raw_glosses": [
        "(poker slang) A hand which can beat a bluff but not any hand better than a bluff."
      ],
      "tags": [
        "slang"
      ],
      "topics": [
        "card-games",
        "poker"
      ]
    }
  ],
  "word": "bluff catcher"
}