Related Clues:

• Use four-letter words
• Oath
• One that's ill-prepared?
• Turn the air blue
• 'May you live in interesting times,' e.g.
• Evil spell
• Say '%@&#!'
• Ornery one
• Say '@#$%!'
• Spit four-letter words
• Imprecate
• Execration
• Blaspheme
• Put a whammy on
• Put a hex on