General Definition: 1. A flat object placed on top of a container of some sort, or any action or any thing directly or indirectly associated with this, especially a lid. As a Noun: 1. The top of a box or other container, such as a jar, which can be removed or raised when you want to open the container. English = lid, cover. As a Verb or Adjective: 1. To close the lid on a container; to cover a container with a lid.