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bad·mouthor bad-mouth (băd′mouth′, -mouth′)
tr.v. bad·mouthed, bad·mouth·ing, bad·mouths or bad-mouthed or bad-mouth·ing or bad-mouths Informal
To criticize or disparage, often spitefully or unfairly: "those cross-Atlantic aficionados who persistently idolize the British theater and bad-mouth Broadway" (Benedict Nightingale).
(tr) slang to speak unfavourably about
or bad′mouth`(ˈbædˌmaʊθ or, sometimes, -ˌmaʊð)
v.t. -mouthed, -mouth•ing.
to criticize, often disloyally.
Past participle: bad-mouthed
vt (inf) → herziehen über (+acc) (inf)