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: to criticize severely
belittle, cry down, decry, denigrate, deprecate, depreciate, derogate, diminish, dis (also diss) [slang], discount, dismiss, disparage, kiss off, minimize, play down, poor-mouth, put down, run down, talk down, trash, trash-talk, vilipend, write off
acclaim, applaud, exalt, extol (also extoll), glorify, laud, magnify, praise
1941, in the meaning defined above
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: to say bad things about (someone or something) : to criticize (someone or something)
See the full definition for bad-mouth in the English Language Learners Dictionary
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by force of circumstances
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