Related Clues:

• Speak bluish?
• Give one's word God damn it!
• Use indecent or blasphemous language
• Risk an FCC fine, perhaps
• Use a lot of four-letter words
• Promise not to mince one's words
• Assert bridge opponents will get attention
• Curse witch, originally ducked in burn
• Monks ultimately accept vow
• Promise (on oath)
• Solemnly promise
• Promise 'Cornish part' leads to 'part of corn'
• Brand carries weight and promise
• Affirm men at the top will make this clothing
• Vow to disregard men in suits, for example