a fund that is used by a business for making regular small payments 定额备用金；定额周转金◆Each office holds an imprest for its running expenses. 每一个办公室都设有供日常开支的定额周转金。◆an imprest account/fund 定额备用金账户；定额备用金➡float , petty cash
an amount of money that is given in advance to sb for a particular purpose 预付款；垫款