Related Clues:
- Not allowed
- Using metallic dishes in a microwave, e.g.
- Something not to talk about
- Cell phone ring in a theater, e.g.
- It's frowned upon
- Smacking one's lips while eating, e.g.
- Forbidden action
- Like a divorce, in some places
- Elbows on the table, e.g.
- Roving eyes on an exam, e.g.
- Don't
- Not permitted
- "___ Nanette"
- Morally wrong
- Social blunder for Nanette?