Definitions for badmouth
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Princeton's WordNet
badmouth, malign, traduce, drag through the mud(verb)
speak unfavorably about
"She badmouths her husband everywhere"
Wiktionary
badmouth(Verb)
To criticize or malign, especially unfairly or spitefully.
Citation
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"badmouth." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/badmouth>.