English version

bad-mouth

From Longman Dictionary of Contemporary Englishbad-mouthˈbad-mouth verb [transitive] especially American English informal  CRITICIZEto criticize someone or something Her former colleagues accused her of bad-mouthing them in public.→ See Verb table
Examples from the Corpus
bad-mouthDivorced parents shouldn't bad-mouth each other in front of the kids.
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Verb table
bad-mouth
Simple Form
Present
I, you, we, theybad-mouth
he, she, itbad-mouths
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Past
I, you, he, she, it, we, theybad-mouthed
Present perfect
I, you, we, theyhave bad-mouthed
he, she, ithas bad-mouthed
Past perfect
I, you, he, she, it, we, theyhad bad-mouthed
Future
I, you, he, she, it, we, theywill bad-mouth
Future perfect
I, you, he, she, it, we, theywill have bad-mouthed
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Continuous Form
Present
Iam bad-mouthing
he, she, itis bad-mouthing
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you, we, theyare bad-mouthing
Past
I, he, she, itwas bad-mouthing
you, we, theywere bad-mouthing
Present perfect
I, you, we, theyhave been bad-mouthing
he, she, ithas been bad-mouthing
Past perfect
I, you, he, she, it, we, theyhad been bad-mouthing
Future
I, you, he, she, it, we, theywill be bad-mouthing
Future perfect
I, you, he, she, it, we, theywill have been bad-mouthing
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