Having a black mouth; (figurative) slanderous; foul-mouthed.
Origin
Mid 16th century; earliest use found in John Heywood (c1496–c1578), playwright and epigrammatist. From black + mouthed. In black-mouthed dogfish after scientific Latin melanostomus.
Definition of black-mouthed in US English:
black-mouthed
adjectiveˈblakˌmaʊðd
Having a black mouth; (figurative) slanderous; foul-mouthed.
Origin
Mid 16th century; earliest use found in John Heywood (c1496–c1578), playwright and epigrammatist. From black + mouthed. In black-mouthed dogfish after scientific Latin melanostomus.