Related Clues:

• Economic warfare tactic
• Societal no-no
• Off-limits: Var.
• Verboten act
• Forbidden practice
• 1931 film that won an Oscar for cinematography
• Unmentionable
• Blockade
• Put a stop to
• Literally, 'I forbid'
• Bad thing to do
• Slurping at the dinner table, e.g.
• Echoing taboo
• Forbidden act
• Not allowed