The crossword solution for the term 'ON SOC. SECURITY, SAY' is RET, which stands for Retirement. Retirement is a term used to describe the period of time when an individual stops working and begins to receive pension benefits from their employer or the government. It is also known as the period of time when an individual is no longer actively employed. Retirement security is a term used to describe the financial stability of individuals during retirement. This includes having enough money to cover basic living expenses, such as food, housing, and medical care.