salt away 用盐腌制;（非正）积蓄，攒钱

【例句】
He salted away a fortune over the years and no one ever knew!
这些年他偷偷地存了一大笔钱却没人知道！

She salted away the profits in foreign bank accounts.
她把赚得的利润存在了外国银行账户上。