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bad-mouth

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bad-mouth someone or something

to say negative things about someone or something. Mr. Smith was always bad-mouthing Mrs. Smith. They just didn't get along. John bad-mouths his car constantly because it is too small for him.

bad-mouth somebody/something

to say unpleasant things about someone or something, especially in order to spoil other people's opinions of them She's always bad-mouthing her colleagues. Bad-mouthing the police is hardly an original occupation.

bad-mouth

1. tv. to speak ill of someone or something. (see also dirty mouth, poor-mouth.) I wish you would stop bad-mouthing my car.

2. n. someone who speaks ill of someone or something. Harry is such a bad-mouth!