One of the mysteries of the English language finally explained.
1‘she was well acquainted with Gothic literature’
familiar, conversant, at home, up to date, up
well versed in, knowledgeable about, well informed about, cognizant in, apprised of, abreast of, no stranger to
au fait, au courant
informal well up on, in the know about, plugged in to, genned up on, clued in on, wise to, hip to
2‘I am not personally acquainted with him’
familiar, friendly, on friendly terms, on good terms, on a sociable footing
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