to make book (third-person singular simple present makes book, present participle making book, simple past and past participle made book)
- (idiomatic) To gamble, either by placing or taking bets.
- 1954, "Into the Stretch," Time, 30 Aug.:
- In the American League, front-running Cleveland was an odds-on favorite with the men who make book on baseball.
- (idiomatic) To be very confident.
- 1909, Rex Ellingwood Beach, The Silver Horde, ch. 25:
- "Oh, you can make book that she didn't start no love-making. She ain't the kind to curl up in a man's ear and whisper."