D defs.my
Entry 2 senses Webster, 1913

Disaffirm

· Dis·af·firm · IPA /dɪsəˈfɜːm/
01 v. t. To assert the contrary of; to contradict; to deny; -- said of that which has been asserted.
  1. 1.
    To assert the contrary of; to contradict; to deny; -- said of that which has been asserted.
  2. 2.
    To refuse to confirm; to annul, as a judicial decision, by a contrary judgment of a superior tribunal.(Law)