The crossword solution for the term 'PUT QUARTERS IN, AS A METER' is FED, which stands for Federal Reserve System. The Federal Reserve System is the central banking system of the United States and is responsible for regulating the country's monetary and financial systems. It is also responsible for issuing currency, setting interest rates, and providing banking services to the government and financial institutions. As part of its duties, the Federal Reserve System oversees the use of coins and currency, including the use of quarters in parking meters.