verb (used with object), bad-mouthed, bad-mouth·ing.
- bad sort, a,
- bad taste,
- bad time,
- bad trip,
- bad trot,
Origin of bad-mouth
"abuse someone verbally," 1941, probably ultimately from noun phrase bad mouth (1835), in Black English, "a curse, spell," translating an idiom found in African and West Indian languages. Related: Bad-mouthed; bad-mouthing.
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]