English

Definition of bosom friend noun from the Oxford Advanced Learner's Dictionary

 

bosom friend

 noun
noun
BrE BrE//ˌbʊzəm ˈfrend//
 
; NAmE NAmE//ˌbʊzəm ˈfrend//
 
(North American English also bosom buddy) Friends
 
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a very close friend The two girls had become bosom friends. See related entries: Friends