gravy train
noun [ C usually singular ] informal uk/ˈɡreɪ.vi ˌtreɪn/ us/ˈɡreɪ.vi ˌtreɪn/
（常指不诚实的）轻松赚大钱的方法，发横财的捷径
a way of making money quickly, easily, and often dishonestly
Compare: easy money
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