Definition of au fait in English:

au fait

Syllabification: au fait
Pronunciation: /ˌō ˈfā
 
/

adjective

(au fait with)
Having a good or detailed knowledge of something: you should be reasonably au fait with the company and its products
More example sentences
  • Engineers in all sectors of industry must be completely au fait with the state of the art.
  • For those of you not quite au fait with Surrealist parlour games, the term ‘exquisite corpse’ originates from the game more commonly known as Consequences.

Origin

mid 18th century: from French, literally 'to the fact, to the point'.

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verb
peep surreptitiously