Related Clues:

• Swear
• Jinx
• Whammy
• Give a damn?
• Talk a blue streak?
• Execrate
• Invoke misfortune
• Persistent bad luck
• Imprecation
• Use four-letter words
• Oath
• One that's ill-prepared?
• Turn the air blue
• 'May you live in interesting times,' e.g.
• Evil spell