Related Clues:
- It's prohibited
- Like divorce, in some places
- Not to be done
- Out of bounds, in a way
- Don't do it
- Gaffe at a social gathering, in modern lingo
- Banned
- Off limits
- Cultural no-no
- Spilling one's drink at a shindig, for one
- ''The Sweetest ___'' (Sade hit)
- Something not done
- Burping in public, e.g.
- Strictly verboten
- Eating pork, to an observant 60-Across