gambling; gaming
speculation; undertaking a risky venture
professional gambler; gamester
博打は禁じられていた。
Gambling was forbidden.
博打にはまって財産を失った。
He got hooked on gambling and lost his fortune.
友人は博打でひと財産作ったと言うが本当だろうか。
My friend claims to have made a fortune gambling, but is that true?