Disavow

DISAVOW - To deny the authority by which an agent pretends to have acted as when he has exceeded the bounds of his authority.

[Anglo-French desclamer, from desclamer to disavow, deny, from Old French des-, prefix marking reversal + clamer to claim see claim]
1 : a refusal or disavowal of something that one has a right to claim
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Some sellers attempt to disavow any responsibility for the quality of their merchandise. Sellers may not disclaim the warranty of merchantability unless they use the word "merchantability" in the disclaimer, which may be oral or written.

Avow. Latin Ad-vovere, to vow to: ad-vocare. To declare openly; to acknowledge and justify an act; opposed to disavow.
Lawful Notice & Caveat
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Austin's exposition of the meaning of the principle is a most valuable contribution to moral science, though he rests its claims ultimately on a basis which many of its supporters would disavow.

See also: Law, Action, Act, Person, Time