Merriam-Webster's Collegiate® Dictionary, 11th Edition
MOUTH
I. noun (plural mouths)
Usage: often attributive
Etymology: Middle English, from Old English mūth; akin to Old High German mund mouth and perhaps to Latin mentum chin Date: before 12th century
1. the natural opening through which food passes into the body of an animal and which in vertebrates is typically bounded externally by the lips and internally by the pharynx and encloses the tongue, gums, and teeth, grimace , an individual requiring food ,
2. voice , speech , mouthpiece 3a, c. a tendency to excessive talk, saucy or disrespectful language ; impudence , something that resembles a mouth especially in affording entrance or exit: as, the place where a stream enters a larger body of water, the surface opening of an underground cavity, the opening of a container, an opening in the side of an organ flue pipe, mouthlike adjective II.
Date: 14th century
transitive verb
1. speak , pro noun ce , to utter bombastically ; declaim , to repeat without comprehension or sincerity , to form soundlessly with the lips , to utter indistinctly ; mumble , to take into the mouth, intransitive verb
1. to talk pompously ; rant , to talk insolently or impudently, to move the mouth especially so as to make faces, mouther noun