The Collaborative International Dictionary of English v.0.48:

burp \burp\ v. i.
   to same as belch; as, In China it is polite to burp at the
   table.

   Syn: bubble, belch, eruct, expel gas.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

burp \burp\ v. t.
   to cause to belch; -- used especially of actions parents take
   to relieve stomach gas in infants; as, mother fed and burped
   the baby, and put her to bed.
   [PJC] burp

The Collaborative International Dictionary of English v.0.48:

burp \burp\, burping \burping\n.
   a reflex that expels wind noisily from the stomach through
   the mouth.

   Syn: belch, belching, burping, eructation.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

burp
    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]