In our life, we may have a nodding acquaintance with many people, but we probably have only one true friend.

我们一生中可能会有很多的泛泛之交，但是真正的朋友可能就那么一个人。

youdao

It's common that one who a nodding acquaintance with many people doesn't have many true friends.

一个有许多点头之交的人却没有很多真正的朋友是很常见的事情。

youdao

I have only a bowing [nodding] acquaintance with him.

我和他只有点头之交。

《新英汉大辞典》

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The first is people with whom we have a nodding social acquaintance, and the second is nothing more than faces we recognize.

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