"Rolling over" refers to a financial practice where an individual transfers funds from one retirement account to another without incurring taxes or penalties. This often occurs when changing jobs or retirement plans, allowing the individual to maintain the tax-deferred status of their savings. Common accounts involved in rolling over include 401(k) plans and IRAs. In addition to retirement accounts, "rolling over" can also apply to other financial products, such as certificates of deposit (CDs). In this context, it means reinvesting the principal and interest earned into a new CD upon maturity, often to take advantage of better interest rates or terms.