That what they call puttin' bad mouth on them and she sho' could do it.
I had very pretty hair, my dear,” said Miss Matilda; “and not a bad mouth.
It was not a bad mouth; her eyes were large, and it was merely large to match them.
One day he visited a child who was sick with a bad mouth, and touching the child's mouth he said, "It will be well soon."
He was a heavy-shouldered man with a bad mouth—a greedy mouth, one would think—and mild eyes.
Many horses will not attempt to run away except for the concurrence of a bad mouth along with an avenue of escape home.
"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.
: If you can't say anything good, at least don't be a bad mouth
To disparage; denigrate: He bad-mouthed everybody (1930s+)