Deactivating a Course
You should consider deactivating a course if it has not been offered for more than a few years and if there are no immediate plans to offer it in the future.
It is not advisable to keep courses active if they are not actually being offered because your failure to evaluate them will negatively affect institutional data.
The directions for deactivating a course are on page 98 of the META Users Manual.
Here is a short video to get you started: