English Etymology Uncertain.[1] Noun English Wikipedia has an article on:Dutch bookWikipedia Dutch book (plural Dutch books) (gambling) A set of trades or bets such that, regardless of the outcome of events, one party strictly profits and another strictly loses. Synonym: lock Derived terms Dutch booked Related terms dutching References [1]http://people.virginia.edu/~pwh2a/dutch%20book%20origins.doc Wikiwand - on Seamless Wikipedia browsing. On steroids.