have a nodding acquaintance with somebody
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acquaintance — ac|quaint|ance [əˈkweıntəns] n ▬▬▬▬▬▬▬ 1¦(somebody you know)¦ 2¦(relationship)¦ 3 make somebody s acquaintance 4¦(knowledge)¦ 5 of your acquaintance 6 on first acquaintance ▬▬▬▬▬▬▬ 1.) ¦(SOMEBODY YOU KNOW)¦ someone you know, but who is not a… … Dictionary of contemporary English