As a Noun: 1. A thing which is placed over another thing to hide or protect it. English = cover, lid, covering. 2. A large flat surface of something this is on top of something else. English = layer. 3. An attempt to hide things and information from people because you don't want them to know about it, especially when you have done wrong. English = cover up. As a Verb or Adjective: 1. To place something over another thing in order to protect or hide it. English = cover. 2. To form a layer over something. English = cover, envelope. 3. To hide things from people because you don't want them to know about it, especially when you have done wrong. English = cover up.