Webster's English Dictionary

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belch

belch \'belch\ vb [ME belchen, fr. OE bealcian] 1: to expel gas suddenly 
   from the stomach through the mouth  2: to erupt, explode, or detonate 
   violently  3: to issue forth spasmodically : GUSH  1: to eject or emit 
   violently  2: to expel (gas) from the stomach suddenly : ERUCT  - belch n