1Aware of what is going on; well informed: they were au courant with the literary scene
up to date, up with, in touch, familiar, at home, acquainted, conversant; abreast of, apprised of, in the know about, well informed about, knowledgeable about, well versed in, enlightened about, aware of, no stranger to; Frenchau fait
British informal switched on to
black English down
mid 18th century: from French, literally 'in the (regular) course'.