Related Clues:

• Render invalid
• Spreadsheet reversal command
• Reverse, as a decision
• Containing nothing
• Command after making a mistake
• Uninhabited
• "Back up" command, in word processing
• Open, as a necktie
• Alternative to 'Continue' in an online order
• Excel command
• Opera by Puccini
• Certain computer command
• Ready for a refill
• Command after "Oops!"
• 'Go back,' on an edit menu