/ · 1894 Brewer’s · A · Au Courant (French)
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“acquainted with” (lit.=in the current [of events]). To keep one au courant of everything that passes, is to keep one familiar with, or informed of, passing events.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.