近义词：情同手足水乳交融

反义词：行同陌路

词语解释

不分彼此[ bù fēn bǐ cǐ ]

⒈  形容关系很密切。

英all is common; be on very intimate terms; with no distinction between what is one's own and what is another's;

国语辞典

不分彼此[ bù fēn bǐ cǐ ]

⒈  比喻感情非常亲密。

例如：「他和我情同手足，不分彼此。」

⒉  同心合力。

引《文明小史·第二二回》：「左右是替皇上家出力，同舟之谊，不分彼此的。」

英语to make no distinction between what's one's own and what's another's (idiom)​, to share everything, to be on very intimate terms