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high roller

noun
🔊/ˌhaɪ ˈrəʊlə(r)/
🔊/ˌhaɪ ˈrəʊlər/
(especially North American English, informal)
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  1. a person who spends a lot of money, especially on gambling挥霍的人；（尤指）豪赌者
    Word Originwith reference to rolling dice.