make a book
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make a book
To set or determine the odds of various competitors' chances of victory, used by gamblers to place bets or wagers. Used especially in horse racing. There is actually a lot of mathematics involved when making a book for a race—it's certainly a lot more than just looking at the horses and guessing!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
make (or open) a book
take bets and pay out winnings on the outcome of a race or other contest or event.Farlex Partner Idioms Dictionary © Farlex 2017