au fait

(ō` fā̍")

[F. Lit., to the deed, act, or point. Fait is fr. L. factum. See Fact.]
Expert; skillful; well instructed.

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(o FAY)

adjective
Being well-informed or skillful in something.

Etymology
From French, literally "to the fact", from Latin facere (to make or do)

Usage
"Some technology degree holders took two years in a job before they were au fait with the practical skills." — Caitlin McKay; Award for Dedication; Manawatu Standard (New Zealand); Aug 27, 2007.

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adj

Definition: familiar
Antonyms: out of touch

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[F] [in adv. phrase] being well instructed in, thoroughly conversant with, expert or skillful in