au fait
adjective/ˌəʊ ˈfeɪ/
/ˌəʊ ˈfeɪ/
[not before noun] (from French)- au fait (with something) completely familiar with something
- I'm new here so I'm not completely au fait with the system.
Word Originmid 18th cent.: from French, literally ‘to the fact, to the point’.Definitions on the go
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au fait