De-function is a term that usually refers to something that was previously functional and has now lost its functionality. Antonyms for de-function would be words that have the opposite meaning and imply the restoration or preservation of functionality. This could include terms like activate, enable, energize, empower, or rejuvenate. Each of these words suggests a process of restoration or renewal, indicating the potential for something amazing to happen once a system or mechanism has been activated. While de-function carries a sense of loss or damage, its antonyms offer hope and promise for the future.