Declass is a term that refers to making secret or classified information available to the public. It is the opposite of classifying information to keep it from being disclosed or shared with others. Antonyms of declass include words that describe the opposite of revealing or uncovering, such as classify, withhold, conceal, hide, and suppress. These words suggest keeping information secret, hidden, or protected. While declassing can be an important part of transparency and open government, there are situations where withholding or preserving confidentiality is necessary to protect national security, privacy, or the interests of individuals.