1.
[syn: abreast(p), au courant, au fait, up on(p)]
The Collaborative International Dictionary of English v.0.48:
Au fait \Au` fait"\ ([=o]` f[asl]"). [F. Lit., to the deed, act,
or point. Fait is fr. L. factum. See Fact.]
Expert; skillful; well instructed.
[1913 Webster]
WordNet (r) 3.0 (2006):
au fait
adj 1: being up to particular standard or level especially in
being up to date in knowledge; "kept abreast of the
latest developments"; "constant revision keeps the book
au courant"; "always au fait on the latest events"; "up
on the news" [syn: abreast(p), au courant, au fait,
up on(p)]