DISAFFIRM

disaffirm. Disaffirm, v.t. to deny, disprove, contradict

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Dis′af‐firm″ (?), v. t. 1. 1. To assert the contrary of; to contradict; to deny; — said of that which has been asserted.
2. 2. (Law) To refuse to confirm; to annul, as a judicial decision, by a contrary judgment of a superior tribunal.