petty cash
noun [ U ] uk/ˌpet.i ˈkæʃ/ us/ˌpet̬.i ˈkæʃ/
（办公室里的）小额现金，小额备用金
a small amount of money kept in an office for buying small things that are needed
Take the money for stamps out of petty cash. 从小额现金里拿出钱来买邮票。
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