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Informal UsePlay
'Chum' is casual and best used among friends, not in professional settings. SlideI'm catching up with my chum after work.
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British OriginPlay
'Chum' is more common in British English and can seem old-fashioned or endearing in American English. SlideMy chum at university recommended this book.
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Age NeutralPlay
'Chum' can denote friendship in any age group, from children to the elderly. SlideOur grandpas are old chums who love chess.