Relearn (verb)

1. To learn something again after forgetting it.
2. To acquire knowledge or skills again after they were lost or forgotten.

Origin:

The word relearn comes from the combination of two words re (again) and learn which means to acquire knowledge or skills through study, experience or instruction.

Examples:

1. She had to relearn how to walk after the accident.
2. He had to relearn the language after living abroad for many years.
3. I had to relearn the material before the exam.
4. The company had to relearn the market after the merger.
5. The patient had to relearn how to speak after the stroke.