It must have cost a tidy sum.
这准花了相当大的一笔钱。
《牛津词典》
He's put aside a tidy sum for his retirement.
他存了一笔相当可观的钱以备退休之用。
youdao
He's earned a tidy sum from his business.
他做生意赚了相当可观的钱。
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