Meaning of “chum” in the English Dictionary

"chum" in American English

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chumnoun [ C ]

us /tʃʌm/ infml

a friend:

Some of our college chums are a little wild.
chummy
adjective us /ˈtʃʌm·i/

infml

She tells the two of them to look chummy for the picture.

(Definition of “chum” from the Cambridge Academic Content Dictionary © Cambridge University Press)