1) Activity at a board 2) Blackboard activity 3) Blackboard chore 4) Causing to disappear 5) Classroom chore 6) Cleaning the blackboard 7) Clearing the board 8) Doing away with a signer 9) Effacing 10) Expunging 11) Frequent schoolroom activity 12) Getting off the tape 13) Getting rid of 14) Going back to the start 1) Rubbing out 
• (p. pr. & vb. n.) of Erase
reducing or cancelling, by a controlled operation, the amount of stored information