Related Clues:

• Demagnetize, maybe
• Rub out with rubber, e.g.
• Use the unsharpened end
• Record silence over
• Edit, in a way
• Hit 'back'
• Clean the slate
• Press the backspace
• Go back a step, in word processing
• Put back the way things were
• Reverse an action
• Clear the whiteboard
• Reverse, as an action
• Word-processor command
• Free of knots