make book

verb2

1. •
   To gamble, either by placing or taking bets.

   • In the American League, front-running Cleveland was an odds-on favorite with the men who make book on baseball. — 1954
2. •
   To be very confident; to be sure.

   • "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." — 1909