have a nodding acquaintance (with someone or something)
To have a slight or precursory knowledge of someone or something. Jim asked me to help fix his computer for him, but I'm afraid I only have a nodding acquaintance with how his machine works. Ruth and I had only a nodding acquaintance before going to the party, but once we got talking, it was like we'd been friends our whole lives. I'll help you as best I can, but I only have a nodding acquaintance with property laws.
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