petty cash

详细解释:零用现金, 小额备用金
【经】 零用现金, 备用金

英语解释：

名词 petty cash:

a small fund of cash that a firm keeps for the payment of incidental expenses

例句：

I'd be careful about putting him in charge of the petty cash; he's got sticky fingers.让他保管零用现金，我得小心，他有小偷小摸的习惯。