Webster's English Dictionary

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chum

1. chum \'ch*m\ n [perh. by shortening & alter. fr. chamber fellow 
   (roommate)] : an intimate friend 
2. chum vi or chummed;  or chum.ming 1: to room together  2: to be an 
   intimate friend 
3. chum n [origin unknown] : chopped fish or other matter thrown overboard 
   to attract fish