杭州中译翻译有限公司质量管理部将备用金英文翻译为Nest egg。Nest egg从字面直译来看是一窝蛋，但是作为意译可以翻译为“备用的钱”或者“储备金”，有如下例句可以供大家参考：
Regular investment of small amounts of money is an excellent way of building a nest egg.
小额固定投资是储蓄的好办法。
All he wanted was a few months decent money to help him retire. He thought this was his last chance to build a nest egg.
他所想要的就是挣一些钱，帮助他退休。他认为这是最后的机会去攒备用金。
She left, and with her nest egg of ,000, started the company.
她辞职了，带着5000美元的备用金，开始做新的公司。
She has a nice little nest egg which she intends to use for travelling round the world one day.
她有一点备用金，是他用来去外面旅游的钱。
有些机构会把备用金翻译为：imprest、imprest cash、imprest fund、imprest warrant，其实这些译法不是很贴切。