Definition of "befoul" [be•foul]

• To make dirty; soil. See Synonyms at contaminate. (verb-transitive)
• To cast aspersions upon; speak badly of. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The teabagger trolls that befoul this blog are Klansmen."
• "He experienced the gall of bitter suffering under a brutal prison regime but did not let spiritual bitterness befoul his soul."
• "Jwest will be the first to throw a hissy fit and befoul his panties after his favorite Starbucks raises their prices 200%."