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

bosom friend

noun
 
/ˌbʊzəm ˈfrend/
 
/ˌbʊzəm ˈfrend/
(North American English also bosom buddy)
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  1. a very close friend
    • The two girls had become bosom friends.
    Topics Family and relationshipsc2
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