bosom friend
noun/ˌbʊzəm ˈfrend/
/ˌbʊzəm ˈfrend/
(North American English also bosom buddy)
- 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。
- The two girls had become bosom friends.
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