Related Clues:

• It's prohibited
• Like divorce, in some places
• Not to be done
• Out of bounds, in a way
• Don't do it
• Banned
• Off limits
• Cultural no-no
• ''The Sweetest ___'' (Sade hit)
• Something not done
• Burping in public, e.g.
• Strictly verboten
• Eating pork, to an observant 60-Across
• No-no of society
• Prohibited thing