Source : Webster's Revised Unabridged Dictionary (1913)

Belch \Belch\ (b[e^]lch; 224), v. t. [imp. & p. p. {Belched}
   (b[e^]lcht); p. pr. & vb. n. {Belching}.] [OE. belken, AS.
   bealcan, akin to E. bellow. See {Bellow}, v. i.]
   1. To eject or throw up from the stomach with violence; to
      eruct.

            I belched a hurricane of wind.        --Swift.

   2. To eject violently from within; to cast forth; to emit; to
      give vent to; to vent.

            Within the gates that now Stood open wide, belching
            outrageous flame.                     --Milton.

Belch \Belch\, v. i.
   1. To eject wind from the stomach through the mouth; to
      eructate.

   2. To issue with spasmodic force or noise. --Dryden.

Belch \Belch\, n.
   1. The act of belching; also, that which is belched; an
      eructation.

   2. Malt liquor; -- vulgarly so called as causing eructation.
      [Obs.] --Dennis.

Source : WordNet®

belch
     n : a reflex that expels wind noisily from the stomach through
         the mouth [syn: {belching}, {burp}, {burping}, {eructation}]
     v 1: expel gas from the stomach; "In China it is polite to burp
          at the table" [syn: {burp}, {bubble}, {eruct}]
     2: become active and spew forth lava and rocks; "Vesuvius
        erupts once in a while" [syn: {erupt}, {extravasate}]