Definition of chum noun from the Oxford Advanced Learner's Dictionary



BrE BrE//tʃʌm//
; NAmE NAmE//tʃʌm//
(old-fashioned, informal) Friends
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a friend an old school chum See related entries: Friends Word Originlate 17th cent. (originally Oxford University slang, denoting a room-mate): probably short for chamber-fellow. Compare with comrade and crony.
See the Oxford Advanced American Dictionary entry: chum