Related Clues:

• Ctrl+Z
• Computer's mistake-fixing command
• Render invalid
• Spreadsheet reversal command
• Reverse, as a decision
• Command after making a mistake
• "Back up" command, in word processing
• Open, as a necktie
• Excel command
• Certain computer command
• Command after "Oops!"
• 'Go back,' on an edit menu
• Useful word processor feature
• Menu option sometimes clicked in desperation
• Invalidate a marriage