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Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Chomp \Chomp\, v. i.
      To chew loudly and greedily; to champ. [Prov. Eng. & Colloq.
      U. S.] --Halliwell.
      [1913 Webster]