General Definition: 1. Any kind of vertical flat surface, such as a notice-board, partition, screen, fence or wall, or any action or thing directly or indirectly related to this, especially board or blackboard. As a Noun: 1. A dark-coloured board in a classroom, which teachers write on with chalk. English = blackboard. 2. A rectangular piece of wood set up so that it is vertical and on which something can be written, put, spread out, or cut. English = board. As a Verb or Adjective: 1. To erect any kind of vertical flat surface over or around something. 2. Of a disused house or building, to cover the windows and doors with wood to prevent people getting in. English = board up.