CD ladder
A set of CDs that mature at different times, so part of your money becomes available every few months.
Instead of putting one large sum in a single CD, you split it across several terms, such as 6, 12 and 18 months. When each CD matures, you can use the cash or roll it into a new CD.
A ladder gives you some of the higher rates of longer CDs while keeping regular access to part of the money.
Example
$9,000 split into $3,000 CDs of 6, 12 and 18 months frees up $3,000 every 6 months.