The term 'pay expenses' can be defined as 'DEFRAY', which is a six-letter word. DEFRAY means to provide money for something, such as paying for expenses. It is often used in the context of business, where it means to pay for the costs associated with running a business, such as rent, utilities, and salaries. In other contexts, it can also mean to pay for someone else's expenses, such as when a person pays for another person's meal or travel costs.