
Chum
Informal Use
'Chum' is casual and best used among friends, not in professional settings.

I'm catching up with my chum after work.
British Origin
'Chum' is more common in British English and can seem old-fashioned or endearing in American English.

My chum at university recommended this book.
Age Neutral
'Chum' can denote friendship in any age group, from children to the elderly.

Our grandpas are old chums who love chess.
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