It can be a nodding acquaintance, a comrade, a confidant, a partner, a playmate, an intimate colleague, etc.
I have a nodding acquaintance with him.
A boy who was only a nodding acquaintance at first occupied almost the whole world.
We were not even nodding acquaintances since we went to junior high school.
Nor until yesterday's cocktail party did I make a nodding acquaintance with Mr. And Mrs. Black.
The old doctor has only a nodding acquaintance with most recent discoveries in medicine.
I have only a nodding acquaintance with him.
He's a nodding acquaintance, but I don't know where he lives.
He and I are not really friends, only nodding acquaintances.
Even the casual workers who man the hot-water furnace have a nodding acquaintance with the girl.
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