chum

1 [chuhm]
noun
1.
a close or intimate companion: boyhood chums.
2.
a roommate, as at college.
verb (used without object), chummed, chumming.
3.
to associate closely.
4.
to share a room or rooms with another, especially in a dormitory at a college or prep school.

Origin:
1675–85; of uncertain origin

Dictionary.com Unabridged

chum

2 [chuhm]
noun
1.
cut or ground bait dumped into the water to attract fish to the area where one is fishing.
2.
fish refuse or scraps discarded by a cannery.
verb (used without object), chummed, chumming.
3.
to fish by attracting fish by dumping cut or ground bait into the water.
verb (used with object), chummed, chumming.
4.
to dump chum into (a body of water) so as to attract fish.
5.
to lure (fish) with chum: They chummed the fish with hamburger.

Origin:
1855–60, Americanism; of uncertain origin

chum

3 [chuhm]
noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chum1 (tʃʌm)
 
n
1.  informal a close friend
 
vb (usually foll by up with) , chums, chumming, chummed
2.  to be or become an intimate friend (of)
3.  (Scot) (tr) to accompany: I'll chum you home
 
[C17 (meaning: a person sharing rooms with another): probably shortened from chamber fellow, originally student slang (Oxford); compare crony]

chum2 (tʃʌm)
 
n
chiefly (US), (Canadian) angling chopped fish, meal, etc, used as groundbait
 
[C19: origin uncertain]

chum3 (tʃʊm)
 
n
a Pacific salmon, Oncorhynchus keta
 
[from Chinook Jargon tsum spots, marks, from Chinook]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

chum
"friend," 1684, university slang, alt. spelling of cham, short for chamber(mate), typical of the late-17c. fondness for clipped words.

chum
"fish bait," 1857, perhaps from Scot. chum "food."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Resident orcas, researchers found, eat chinook and chum salmon.
Throw out the names of other firms that would be overjoyed to hire your chum.
They hold their wings out, drop their feet into the water, and pick up pieces
  of the chum we've put out.
They caught blue fish, ate their sandwiches and ran a chum slick a mile long
  without raising a mako.
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