Un-cover is a verb that means to reveal or make visible something that was previously hidden or covered. Antonyms for this word are words that convey the opposite meaning, namely to hide, conceal or cover something up. These words include words such as conceal, bury, camouflage, cloak, mask or veil. For instance, one might cover or hide something to keep it out of sight or to keep it in protected an area. Similarly, we might conceal something from view or mask it with another object to keep it from being seen or discovered. In short, while the word "un-cover" means to reveal, its antonyms signify to keep hidden.