De-value means to decrease the worth of something. Its antonyms are the words that indicate increasing the worth or value of something. Some common antonyms for de-value are appreciate, enhance, raise, promote, and upgrade. For instance, when a company invests in its employees, it enhances their value and helps to promote career growth. Similarly, taking care of your assets like a car or a house can help in appreciating their value over time. In contrast, if one fails to maintain something, it'll likely de-value the same. Antonyms of de-value are necessary in everyday communication as they help us express our thoughts effectively and clearly.