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un·dorse /enˈdôrs/ Verb
1. Renege one's public approval or support of.
2. To not recommend (a product) in an advertisement.

Also: Undorsed, Undorsement.
In its latest publicity stunt, the racy teen retailer is offering to pay Mike "The Situation" Sorrentino — the "Jersey Shore" reality show cast member known for showing off his abdominal muscles, to not wear its merchandise. Abercrombie, effectively undorsed The Situation.
by Nabeel S August 17, 2011
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2
The act of telling people who NOT to vote for, buy from, or otherwise support.
As a staunch Republican, I will undorse Hillary Clinton in '08.
by Mandy Connell March 28, 2007
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