It means to develop a plan to withdraw funds from your retirement savings to ensure your money could outlive your life.
How to manage retirement funds withdrawals?
There are several ways, the money common way is the 4% withdrawal rate, and use inflation rate as the guide for adjustment. However, the 4% rate assumes you will live 30 years, so you will need to adjust it based on your actual age. Also, we have discussed several other better ways than this traditional rule of thumb here and here.