Bookmaker/ˈbʊkmeɪkər/ Definition 1 of 2Pro Tip 1/3Sporting Context Used when talking about betting on sports and other competitive events. She contacted a bookmaker to bet on the soccer game. Pro Tip 2/3Legality Matters May refer to legal or illegal gambling, context usually clues you in. The local bookmaker got arrested for running an illegal betting operation. Pro Tip 3/3Not a Reader Don't confuse with someone who enjoys reading. It's about gambling! He's a bookmaker, not a bookworm. He takes bets, not reads books.