"Dutch book" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en"
      },
      "expansion": "Uncertain",
      "name": "unc"
    }
  ],
  "etymology_text": "Uncertain.",
  "forms": [
    {
      "form": "Dutch books",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Dutch book (plural Dutch books)",
      "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": "Gambling",
          "orig": "en:Gambling",
          "parents": [
            "Games",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "Dutch booked"
        }
      ],
      "glosses": [
        "A set of trades or bets such that, regardless of the outcome of events, one party strictly profits and another strictly loses."
      ],
      "id": "en-Dutch_book-en-noun-S~vNwhgM",
      "links": [
        [
          "gambling",
          "gambling#Noun"
        ],
        [
          "trade",
          "trade"
        ],
        [
          "bet",
          "bet"
        ],
        [
          "profit",
          "profit"
        ]
      ],
      "raw_glosses": [
        "(gambling) A set of trades or bets such that, regardless of the outcome of events, one party strictly profits and another strictly loses."
      ],
      "related": [
        {
          "word": "dutching"
        }
      ],
      "synonyms": [
        {
          "word": "lock"
        }
      ],
      "topics": [
        "gambling",
        "games"
      ],
      "wikipedia": [
        "Dutch book"
      ]
    }
  ],
  "word": "Dutch book"
}

{
  "derived": [
    {
      "word": "Dutch booked"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en"
      },
      "expansion": "Uncertain",
      "name": "unc"
    }
  ],
  "etymology_text": "Uncertain.",
  "forms": [
    {
      "form": "Dutch books",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Dutch book (plural Dutch books)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "dutching"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with unknown etymologies",
        "en:Gambling"
      ],
      "glosses": [
        "A set of trades or bets such that, regardless of the outcome of events, one party strictly profits and another strictly loses."
      ],
      "links": [
        [
          "gambling",
          "gambling#Noun"
        ],
        [
          "trade",
          "trade"
        ],
        [
          "bet",
          "bet"
        ],
        [
          "profit",
          "profit"
        ]
      ],
      "raw_glosses": [
        "(gambling) A set of trades or bets such that, regardless of the outcome of events, one party strictly profits and another strictly loses."
      ],
      "synonyms": [
        {
          "word": "lock"
        }
      ],
      "topics": [
        "gambling",
        "games"
      ],
      "wikipedia": [
        "Dutch book"
      ]
    }
  ],
  "word": "Dutch book"
}