"Be the banker" is a popular phrase used in various games such as monopoly where one player takes on the role of the banker. However, there are many other ways to express this concept using different words. Some synonyms for saying "be the banker" include being the financier, being the lender, being the holder of funds, being the creditor, or being the custodian of the cash. All of these phrases convey the same idea of being in charge of the game's money and transactions. Using different terms can add diversity and clarity to the language used during gameplay, and it can make the experience more enjoyable.