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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 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.