It was just a simple greeting, but somehow I got strangely tense.
I have a bowing acquaintance with Mr Smith.
I have a nodding acquaintance with Mr Smith.
He nodded to me as he passed.
Nancy greeted me with a nod from across the street.
When he met the lady, he raised his hat.
I have a nodding acquaintance with him.
He acknowledged me by raising his hat.
The prince bowed down to Snow White.
I don't know any more about him. I know him, but only to say Hello to.