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A decision that has already been made or something that has already been accomplished or completed. The decision by the CEO to close 50 of the company's stores came as a fait accompli to the rest of the management team, who were powerless to stop it. Failing this class is not a fait accompli—you have the ability to study and bring up your grade!
be au fait with
To be knowledgeable and prepared with the latest information on a particular subject. "Au fait" is French for "to the fact." Please review these reports so that you are au fait with the latest market trends.
be au fait with something
to know a lot about a subject Are you au fait with the latest developments in computer technology?
a fait accompli
a decision or action which has already been made or done and which cannot be changed The sudden change in policy was presented to the party as a fait accompli, without any consultation.