a private coffer

• 小金库

a private coffer的用法和样例：

例句

1. Parents have to save money for their kids, private cashbox exists between a couple, we need to save for our future use.
   做父母的要给自己的孩子攒钱，夫妻之间还难免有私人的小金库存在，我们也要为自己的将来打算。