Related Clues:

• Taboo thing
• Casino target
• Truculent sort
• Use a crib, perhaps
• ''___, Nanette''
• Eat cake on your diet, e.g.
• Rich dessert, to a dieter
• Putting regular gas in a diesel engine, e.g.
• It's to be avoided
• It's taboo
• It's a bad thing
• Copy, maybe
• Admonishing utterance
• Steal answers
• Something best avoided