Petty cash: small amount of money kept in an office for buying small things that are needed.

小额现金：放在办公室准备购买所需的小件东西的小部分钱

I need to buy some more notepads for my office. Do you know who I should talk to?
我需要给办公室再买些记事本。你知道我我应该找谁吗？

See if we have any money in the petty cash fund, you can take it directly from there.

看看，如果我们的零用钱基金里有钱，你就可以直接从那里面拿了。