Definition of make or open a book in English:

make (or open) a book

(US make book)
Take bets and pay out winnings on the outcome of a race or other contest or event: the bookies opened a book on his successor
More example sentences
  • You can think of it as an American alternative to those famous London betting shops that will make book on just about anything.
  • It will probably do worse - since the kind of events he wants to make book on are even more unpredictable and emotional than elections.
  • The company is always game to open a book on most events and we do get some unusual requests.
See parent entry: book

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous