A2
a large board with a dark surface that a teacher writes on with chalk
Dictionary examples:
The students laughed when the teacher accidentally wrote on the blackboard with chocolate. (0.0)
The teacher's cat walked on the blackboard, leaving funny paw prints. (0.0)
The new student thought the blackboard was a big TV screen. (0.0)
She wrote her name on the blackboard. (16.4)