Related Clues:

• Turn the air blue
• Witness stand words
• Be a sign of
• Scout's recitation
• Invective
• Swear to
• See 68-Across
• Solemn vow
• State with conviction
• State categorically
• '@#$%!,' e.g.
• Say '@#$%!'
• Promise confidently
• Swearing-in highlight
• Free from doubt