Related Clues:

• Slander
• Stain
• Blacken
• Bad-mouth
• Smudge
• Cast aspersions on
• It may be found in a proof
• Delete, with 'out'
• Sully
• Spread
• Splotch
• Sling mud
• Dirty political tactic
• Proof goof
• Rorschach stain