A black-mouthed person or animal; fig. a foul-mouthed person, a slanderer.
1642. Lond. Apprent. Decl., in Harl. Misc. (Malh.), V. 307. As some blackmouths have uncharitably belched out against us.
1656. Trapp, Comm. John ix. 28. Every black-mouth cast dirt upon Christ’s disciples.
