Banks often act as a depository for their clients' funds.

depository 是名词，由动词 deposit（存放、寄存）加上后缀 -ory（表示"与...有关的场所"）构成，字面意思是"存放物品的场所"。在金融领域特指"托管机构"，即专门负责保管客户资金或贵重物品的机构。