Related Clues:

• Major no-no
• Forbidden fruit
• Proscription
• Double negative?
• Naughty deed
• Forbidden thing
• Verboten
• Prohibition
• Jaywalking, e.g.
• Inadvisable action
• Rule breaker
• Eating peas with a knife, e.g.
• Proscribed
• Dessert, say, to a dieter
• Dessert, to a dieter