[n. mouth; v. mouth]
noun, plural mouths [mouthz] .
Anatomy, Zoology.
the opening through which an animal or human takes in food.
the cavity containing the structures used in mastication.
the masticating and tasting apparatus.
utterance or expression: to give mouth to one's thoughts.
talk, especially loud, empty, or boastful talk: That man is all mouth.
disrespectful talk or language; back talk; impudence.
a grimace made with the lips.
the opening between the jaws of a vise or the like.
the lateral hole of an organ pipe.
the lateral blowhole of a flute.
verb (used with object)
to utter or pronounce softly and indistinctly; mumble: Stop mouthing your words and speak up.
to put or take into the mouth, as food.
verb (used without object)
to speak sonorously and oratorically, or with excessive mouth movement.
to grimace with the lips.
Verb phrases
mouth off, Slang.
to talk back; sass: He mouthed off to his mother.
to express one's opinions, objections, or the like in a forceful or uninhibited manner, especially in public.
down in/at the mouth, Informal. dejected; depressed; disheartened: Ever since he lost his job, he has been looking very down in the mouth.
run off at the mouth, Informal. to talk incessantly or indiscreetly.

before 900; Middle English; Old English mūth; cognate with German Mund, Old Norse munnr

mouther, noun
mouthless, adjective
outmouth, verb (used with object)

5. voice, speech.
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World English Dictionary
n , pl mouths
3.  the visible part of the lips on the faceRelated: oral, oscular
4.  a person regarded as a consumer of food: four mouths to feed
5.  verbal expression (esp in the phrase give mouth to)
6.  a particular manner of speaking: a foul mouth
7.  informal boastful, rude, or excessive talk: he is all mouth
8.  the point where a river issues into a sea or lake
9.  the opening of a container, such as a jar
10.  the opening of or place leading into a cave, tunnel, volcano, etc
11.  that part of the inner lip of a horse on which the bit acts, esp when specified as to sensitivity: a hard mouth
12.  music the narrow slit in an organ pipe
13.  the opening between the jaws of a vice or other gripping device
14.  a pout; grimace
15.  by word of mouth orally rather than by written means
16.  down in the mouth, down at the mouth in low spirits
17.  informal have a big mouth, open one's big mouth to speak indiscreetly, loudly, or excessively
18.  keep one's mouth shut to keep a secret
19.  put one's money where one's mouth is to take appropriate action to support what one has said
20.  put words into someone's mouth
 a.  to represent, often inaccurately, what someone has said
 b.  to tell someone what to say
21.  informal run off at the mouth to talk incessantly, esp about unimportant matters
vb (usually foll by at)
22.  to speak or say (something) insincerely, esp in public
23.  (tr) to form (words) with movements of the lips but without speaking
24.  (tr) to accustom (a horse) to wearing a bit
25.  (tr) to take (something) into the mouth or to move (something) around inside the mouth
26.  to make a grimace
Related: oral, oscular
[Old English mūth; compare Old Norse muthr, Gothic munths, Dutch mond]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

O.E. muþ, from P.Gmc. *munthaz (cf. O.Fris. muth, O.N. munnr, M.Du. mont, Ger. Mund, Goth. munþs "mouth"), with characteristic loss of nasal consonant in O.E. (cf. tooth, goose, etc.), from PIE *mnto-s (cf. L. mentum "chin"). In the sense of "outfall of a river" it is attested from early
12c.; as the opening of anything with capacity (a bottle, cave, etc.) it is recorded from c.1200. The verb is c.1300, "to speak," from the noun.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

mouth (mouth)
n. pl. mouths (mouðz)

  1. The body opening through which an animal takes in food.

  2. The oral cavity.

  3. The opening to any cavity or canal in an organ or a bodily part.

The American Heritage® Stedman's Medical Dictionary
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