Definition of chummy adjective from the Oxford Advanced American Dictionary

 

chummy

 adjective
adjective
NAmE//ˈtʃʌmi//
 
(old-fashioned)(informal)
 
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very friendly
NAmE//ˈtʃʌməli//
 
adverb
 
noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: chummy