Third person singular present tense of badmouth; speaks negatively about someone or something.
From 'badmouth' in its present tense conjugation. The '-s' ending follows standard English verb conjugation for third person singular subjects (he/she/it badmouths).
The fact that we have this specific word tells us badmouthing is common enough to need a regular verb—it's so normal to speak ill of others that English gave it a dedicated verb form rather than just using 'speaks badly of'!
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