De-values means to reduce the worth or importance of something. Antonyms of de-values would be to enhance or appreciate the value of something. Synonyms of these antonyms include elevate, increase, strengthen, and uplift. For example, if you talk positively about someone's work, it could enhance or appreciate the value of their effort. Similarly, if you invest in something that has the potential to grow, you can increase its value. In a business context, it is important to avoid actions that de-value a company, such as cutting corners or producing low-quality products. Instead, companies should focus on strategies that enhance their value in the marketplace.