bookie's runner
Someone who works for a bookmaker, as by collecting bets. A: "I know that guy, he's a bookie's runner." B: "If he's talking to Tom, does that mean Tom's gambling again?" He's a bookie's runner—he doesn't care if you succeed or fail, he just cares if he gets a bet from you or not. Back when I had a gambling problem, I practically had my bookie's runner on speed dial.
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