Related Clues:

• "I'd advise against it"
• "Cut that out!"
• "__ go there!"
• Thing to avoid
• Mother's admonition
• Burping in public, e.g.
• Ill-advised move
• Off-limits act
• It just isn't done
• Strictly verboten
• Succinct warning
• Non-starter
• ''__ you dare!''
• Something proscribed
• Banned behavior