Related Clues:

• Improper act
• Sticking a fork in the toaster, e.g.
• Toddler's taboo
• Something taboo
• Sonar user
• Moral philosophy topic
• Warship
• Stand-in, for short
• Kid's taboo
• Thing to shun
• U-boat, e.g.
• Footlong, e.g.
• ''___ Nanette''
• 104-Across, for one
• Something forbidden