Related Clues:

• Use salty language
• Use some &$^#ing bad language
• Cornish listener's promise?
• 'Ornery' sort
• Say '$%$#!'
• Swear (informal)
• Say a bad word
• Unsolemnly swear
• “They say all lovers ___ more performance than they are able” (Troilus and Cressida)
• Curse from Cornish listener?
• Promise son to be in
• Swear in debate there's no hell
• React to a hammered thumb, perhaps
• Give more than a darn?
• Talk dirty