泛泛之交 Casual acquaintance
Explanation
泛泛之交指关系一般，交往不深的朋友。形容交情不深，只是普通朋友。
The idiom "fanfan zhi jiao" (泛泛之交) means a casual acquaintance or someone you only know superficially.
Origin Story
大学时代，小李和小王在一个社团认识，因为共同的爱好，他们经常一起参加活动，一起学习，一起吃饭，关系不错。毕业后，两人联系渐渐减少，偶尔在社交媒体上点赞评论，联系很少，只是泛泛之交了。小李后来去了南方工作，小王留在北方，两人距离越来越远，即使见面也仅仅是寒暄几句，再也回不到曾经的亲密无间。时间久了，两人之间的联系就淡了，他们成为了泛泛之交，虽然曾经有过美好的回忆，但如今已经只是点头之交了。
In college, Xiao Li and Xiao Wang met in a club. Because of their shared interests, they often participated in activities, studied together, and ate together. After graduation, their contact gradually decreased. Occasionally, they would like and comment on each other's posts on social media. Their relationship was reduced to a casual acquaintance. Xiao Li later went to work in the south, while Xiao Wang stayed in the north. The distance between them grew, and even when they met, they only exchanged a few pleasantries. Their former intimacy was gone. Over time, their connection faded, becoming merely a casual acquaintance, despite the fond memories they once shared.
Usage
泛泛之交通常用于描述人际关系，侧重于交情不深。
The phrase "fanfan zhi jiao" is used to describe a relationship with someone you don't know very well; a superficial friendship.
Examples
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我和他只是泛泛之交，并不熟悉。
wo he ta zhishi fanfan zhi jiao, bing bu shuxi.
I only know him casually.
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他们两人只是泛泛之交，并没有深厚的友谊。
tamen liang ren zhishi fanfan zhi jiao, bing meiyou shenhou de youyi
They are just acquaintances, not close friends.