[1] : The Collaborative International Dictionary of English v.0.48

chum \chum\ chu^m, n. perh. a contraction fr. comrade or
   chamber fellow: cf. also as. cuma a comer, guest.
   a roommate, especially in a college or university; an old and
   intimate friend.
   1913 webster

   new chum, a recent immigrant. australia
      webster 1913 suppl.
see also:
new chum 

[2] : The Collaborative International Dictionary of English v.0.48

chum \chum\, v. i. imp. p. p. chummed; p. pr.  vb. n.
   chumming.
   to occupy a chamber with another; as, to chum together at
   college. u. s.
   1913 webster
see also:
chummed chumming 

[3] : The Collaborative International Dictionary of English v.0.48

chum \chum\, n.
   chopped pieces of fish used as bait. u. s.
   1913 webster

[4] : WordNet (r) 2.0

chum
     n : a close friend who accompanies his buddies in their
         activities syn: buddy, brother, crony, pal, sidekick
     also: chumming, chummed
see also:
buddy brother crony pal sidekick chumming 
chummed 

[5] : Moby Thesaurus II by Grady Ward, 1.0

80 moby thesaurus words for "chum":
   ace, amigo, associate, associate with, assort with, bedfellow,
   bedmate, bosom buddy, buddy, bunkie, bunkmate, butty, camarade,
   chamberfellow, chum together, chum with, classmate, clique,
   clique with, club together, colleague, comate, companion, company,
   compeer, comrade, confidante, confrere, consociate, consort,
   consort with, copartner, crony, familiar, fellow, fellow student,
   fellowship, flock together, fraternize, friend, girl friend,
   go with, gossip, hang around with, hang out with, herd together,
   hobnob with, join, join in fellowship, keep company with, mate,
   messmate, mingle with, mix with, old crony, pal, pal up with,
   pal with, pard, pardner, partner, playfellow, playmate, roommate,
   run in couples, run with, running mate, schoolfellow, schoolmate,
   shipmate, side partner, sidekick, sort with, take up with,
   team up with, teammate, tie up with, workfellow, yokefellow,
   yokemate

Chum >> C Words
Chum, definition of term: Chum
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