to disavo

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
TO DISAVOW. To deny the authority by which an agent pretends to have acted 
as when he has exceeded the bounds of his authority. 
     2. It is the duty of the principal to fulfill the contracts which have 
been entered into by his authorized agent; and when an agent has exceeded 
his authority, he ought promptly to disavow such act, so that the other 
party may have his remedy against the agent. See Agent; Principal. 
    

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