The Collaborative International Dictionary of English v.0.48:

Belch \Belch\, v. i.
   1. To eject wind from the stomach through the mouth; to
      eructate.
      [1913 Webster]

   2. To issue with spasmodic force or noise. --Dryden.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Belch \Belch\, n.
   1. The act of belching; also, that which is belched; an
      eructation.
      [1913 Webster]

   2. Malt liquor; -- vulgarly so called as causing eructation.
      [Obs.] --Dennis.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Belch \Belch\ (b[e^]lch; 224), v. t. [imp. & p. p. Belched
   (b[e^]lch); 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.
      [1913 Webster]

            I belched a hurricane of wind.        --Swift.
      [1913 Webster]

   2. To eject violently from within; to cast forth; to emit; to
      give vent to; to vent.
      [1913 Webster]

            Within the gates that now
            Stood open wide, belching outrageous flame.
                                                  --Milton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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