au fait

Definition

Being familiar with or informed about something.

Etymology

Borrowed from French au fait (literally “at the fact”).

Example Sentences

• "Are you au fait with the rules of the game?"
• "The Chevalier was, as usual, au fait at all the anecdotes of the court, which had been exceedingly gay, owing to the visit of Madame de Savoie and her daughter, the Princess Marguerite."
• "Now there is father; he is au fait in all these matters; has a theory for every case of whooping-cough, – and a mission school."