Related Clues:

• Refute a claim
• Refuse to approve
• Deprive of
• Argue back
• Refuse to believe
• Try to disprove
• Say 'No, I didn't'
• Attempt to disprove
• Make null and void
• Last word of 'For He's a Jolly Good Fellow'
• Counterpunch, in a way
• "... that nobody can ___"
• Opposite of grant
• Opposite of allow
• Render invalid