badmouth

tr.v. Informal, -mouthed, or -mouthed, -mouth·ing, or -mouth·ing, -mouths, or -mouths.
To criticize or disparage, often spitefully or unfairly: "those cross-Atlantic aficionados who persistently idolize the British theater and bad-mouth Broadway" (Benedict Nightingale).

Disparage or criticize unduly, malign, as in Why do you constantly bad mouth your colleagues? This term is believed to be of African origin, where the phrase bad mouth signifies a curse or evil spell. [1930s]

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Note: click on a word meaning below to see its connections and related words.

The verb has one meaning:

Meaning #1: speak unfavorably about
  Synonyms: malign, traduce, drag through the mud

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Dansk (Danish)
v. tr. - sprede ondsindede rygter, fare med sladder

Nederlands (Dutch)
kwaadspreken

Français (French)
v. tr. - calomnier, (US) débiner

Deutsch (German)
v. - tratschen

Ελληνική (Greek)
v. - κακολογώ, "θάβω"

Italiano (Italian)
denigrare

Português (Portuguese)
v. - fofocar, falar mal de alguém pelas costas

Русский (Russian)
поливать грязью

Español (Spanish)
v. tr. - difamar, hablar mal, murmurar

Svenska (Swedish)
v. - racka ner på, svärta ner

中文（简体）(Chinese (Simplified))
恶意中伤, 诽谤

中文（繁體）(Chinese (Traditional))
v. tr. - 惡意中傷, 誹謗

한국어 (Korean)
v. tr. - ~의 욕을 하다

日本語 (Japanese)
n. - 中傷, 悪口, 批評

العربيه (Arabic)
‏(فعل) يشوه السمعه, يحط من قدر, يفتري‏

עברית (Hebrew)
v. tr. - ‮הלעיז, השמיץ‬

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