disaffirm (?.)

• abjure
• assert the contrary
• belie
• contest
• contradict
• contravene
• controvert
• counter
• cross
• deny
• disallow
• disavow
• disclaim
• disown
• disprove
• dispute
• forswear
• gainsay
• impugn
• join issue upon
• negate
• negative
• not accept
• not admit
• nullify
• oppose
• recant
• refuse to admit
• refute
• renounce
• repudiate
• retract
• revoke
• take back
• take issue with
• traverse