Using foul or scurrilous language; slanderous.

Not sensitive to the bit; not easily governed. / Hard-featured about the mouth.

Expanding at the mouth.

(obsolete) Having a projecting under jaw; prognathous.

An aphthous ulcer; an open sore in the mouth, or rarely a break in the mucous membrane or the epithelium on the lips or surrounding the mouth.

Alternative form of birdsmouth.

(dated, usually with "at") To make faces (at someone), to fun (of someone), to laugh (at someone).

Extreme tooth decay resulting from long-term use of methamphetamine.

A person having a mouth full of words; a chatterer.

(obsolete, UK) A superficially friendly person, who is otherwise not a friend.