Source : Webster's Revised Unabridged Dictionary (1913)

Mouth \Mouth\ (mouth), n.; pl. {Mouths} (mou[th]z). [OE. mouth,
   mu[thorn], AS. m[=u][eth]; akin to D. mond, OS. m[=u][eth],
   G. mund, Icel. mu[eth]r, munnr, Sw. mun, Dan. mund, Goth.
   mun[thorn]s, and possibly L. mentum chin; or cf. D. muil
   mouth, muzzle, G. maul, OHG. m[=u]la, Icel. m[=u]li, and Skr.
   mukha mouth.]
   1. The opening through which an animal receives food; the
      aperture between the jaws or between the lips; also, the
      cavity, containing the tongue and teeth, between the lips
      and the pharynx; the buccal cavity.

   2. Hence: An opening affording entrance or exit; orifice;
      aperture; as:
      (a) The opening of a vessel by which it is filled or
          emptied, charged or discharged; as, the mouth of a jar
          or pitcher; the mouth of the lacteal vessels, etc.
      (b) The opening or entrance of any cavity, as a cave, pit,
          well, or den.
      (c) The opening of a piece of ordnance, through which it
          is discharged.
      (d) The opening through which the waters of a river or any
          stream are discharged.
      (e) The entrance into a harbor.

   3. (Saddlery) The crosspiece of a bridle bit, which enters
      the mouth of an animal.

   4. A principal speaker; one who utters the common opinion; a
      mouthpiece.

            Every coffeehouse has some particular statesman
            belonging to it, who is the mouth of the street
            where he lives.                       --Addison.

   5. Cry; voice. [Obs.] --Dryden.

   6. Speech; language; testimony.

            That in the mouth of two or three witnesses every
            word may be established.              --Matt. xviii.
                                                  16.

   7. A wry face; a grimace; a mow.

            Counterfeit sad looks, Make mouths upon me when I
            turn my back.                         --Shak.

   {Down in the mouth}, chapfallen; of dejected countenance;
      depressed; discouraged. [Obs. or Colloq.]

   {Mouth friend}, one who professes friendship insincerely.
      --Shak.

   {Mouth glass}, a small mirror for inspecting the mouth or
      teeth.

   {Mouth honor}, honor given in words, but not felt. --Shak.

   {Mouth organ}. (Mus.)
      (a) Pan's pipes. See {Pandean}.
      (b) An harmonicon.

   {Mouth pipe}, an organ pipe with a lip or plate to cut the
      escaping air and make a sound.

   {To stop the mouth}, to silence or be silent; to put to
      shame; to confound.

            The mouth of them that speak lies shall be stopped.
                                                  --Ps. lxiii.
                                                  11.

            Whose mouths must be stopped.         --Titus i. 11.

Mouth \Mouth\, v. t. [imp. & p. p. {Mouthed}; p. pr. & vb. n.
   {Mouthing}.]
   1. To take into the mouth; to seize or grind with the mouth
      or teeth; to chew; to devour. --Dryden.

   2. To utter with a voice affectedly big or swelling; to speak
      in a strained or unnaturally sonorous manner. ``Mouthing
      big phrases.'' --Hare.

            Mouthing out his hollow oes and aes.  --Tennyson.

   3. To form or cleanse with the mouth; to lick, as a bear her
      cub. --Sir T. Browne.

   4. To make mouths at. [R.] --R. Blair.

Mouth \Mouth\, v. i.
   1. To speak with a full, round, or loud, affected voice; to
      vociferate; to rant.

            I'll bellow out for Rome, and for my country, And
            mouth at C[ae]sar, till I shake the senate.
                                                  --Addison.

   2. To put mouth to mouth; to kiss. [R.] --Shak.

   3. To make grimaces, esp. in ridicule or contempt.

            Well I know, when I am gone, How she mouths behind
            my back.                              --Tennyson.

Source : WordNet®

mouth
     v 1: express in speech; "She talks a lot of nonsense"; "This
          depressed patient does not verbalize" [syn: {talk}, {speak},
           {utter}, {verbalize}, {verbalise}]
     2: articulate silently; form words with the lips only; "She
        mouthed a swear word"
     3: touch with the mouth

mouth
     n 1: the opening through which food is taken in and vocalizations
          emerge; "he stuffed his mouth with candy" [syn: {oral
          cavity}, {oral fissure}, {rima oris}]
     2: the externally visible part of the oral cavity on the face
        and the system of organs surrounding the opening; "she
        wiped lipstick from her mouth"
     3: an opening that resembles a mouth (as of a cave or a gorge);
        "he rode into the mouth of the canyon"; "they built a fire
        at the mouth of the cave"
     4: the point where a stream issues into a larger body of water;
        "New York is at the mouth of the Hudson"
     5: a person conceived as a consumer of food; "he has four
        mouths to feed"
     6: a spokesperson (as a lawyer) [syn: {mouthpiece}]
     7: an impudent or insolent rejoinder; "don't give me any of
        your sass" [syn: {sass}, {sassing}, {backtalk}, {back talk},
         {lip}]
     8: the opening of a jar or bottle; "the jar had a wide mouth"