Archaic British slang for a fraudulent bookmaker — someone who takes bets without the intention or means to pay out winnings. The term was used at racecourses and sporting events in the 19th and early 20th centuries. A bester would typically take money and disappear before winnings needed to be paid.
He lost his money to a bester at the races and had no way to get it back.
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(UK, slang, archaic) A fraudulent bookmaker.
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