badmouth

bad·mouth or bad-mouth  (bdmouth, -mou)

tr.v. bad·mouthed or bad-mouthed, bad·mouth·ing or bad-mouth·ing, bad·mouths 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).

Thesaurus

Verb

1.

badmouth - speak unfavorably about; "She badmouths her husband everywhere" drag through the mud, malign, traduce asperse, besmirch, calumniate, defame, slander, smirch, denigrate, sully, smear - charge falsely or with malicious intent; attack the good name and reputation of someone; "The journalists have defamed me!" "The article in the paper sullied my reputation"

Translations

badmouth [ˈbædˌmaʊθ] VT → hablar pestes de