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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!
See also: fait
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.