The word "over-value" refers to the act of placing too much emphasis on the importance, cost, or worth of something. Antonyms for this word may include "undervalue," "neglect," or "underestimate." When you undervalue something, you downplay its worth or importance. On the other hand, to neglect something implies paying little or no attention to its value or worth. Finally, to underestimate something means to assess its worth incorrectly or to consider it as less valuable than it actually is. To use antonyms effectively, one must consider the context and use the word that best fits the situation to create clarity in their communication.