Many businesses have a "hidden" fund of money, often kept in the drawer of the secretary that can be used by someone in charge for personals or for emergencies. This is called 'petty cash', probably related to the French word petit , meaning little or insignificant. The money does not belong to any item in the budget.
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Anonymous Charge it to petty cash.In accounting it means: Credit the "Petty Cash Account", meaning that money is removed from that account. (And debit some other account, e.g., Office Supplies, meaning that's what you used the cash for.)