bosom friend

noun
🔊/ˌbʊzəm ˈfrend/
🔊/ˌbʊzəm ˈfrend/
(North American English also bosom buddy)
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  1. a very close friend密友;知己
    • The two girls had become bosom friends.这两个女孩变成了知心朋友。
    Topics Family and relationshipsc2