au fait /əʊ ˈfeɪ $ oʊ-/ BrE AmE adjective
be au fait with something to be familiar with a system or way of doing something:
I’m not really au fait with the computer system yet.
au fait /əʊ ˈfeɪ $ oʊ-/ BrE AmE adjective
be au fait with something to be familiar with a system or way of doing something:
I’m not really au fait with the computer system yet.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012