Related Clues:

• Coke or Pepsi
• Defile
• Contaminate
• Stock marker
• Pollute
• Trace of dishonor
• Tarnish, as a reputation
• Trademarked name
• A store might have its own
• "'Tis!" response
• Disgrace trace
• 'Tis counter
• Impress indelibly
• Rancher's mark
• Slangy opposite of 'tis