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English definition of “chum”

chum

noun [C]  /tʃʌm/ infml us  
a friend: Some of our college chums are a little wild.
chummy
adjective  /ˈtʃʌm·i/ us  
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)
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