Be on nodding terms with somebody - Idioms by The Free Dictionary
be on nodding terms with somebody
be on nodding terms (with someone)
To not know someone well. The two of us are just on nodding terms—I couldn't even tell you his name. I'm only on nodding terms with her sister, so I can't ask her for a favor like that.
be on ˈnodding terms with somebody know somebody not very well, but well enough to say ‘hello’ when you meet them: We’re on nodding terms with our neighbours but we don’t know anyone else at all.