Done deed is an idiom which means a completed or finished action. There are various synonyms to this phrase that can convey the same meaning. One such phrase is "accomplished fact." It refers to an event that has already taken place and can no longer be changed or reversed. Another synonym is "fait accompli," a term used to refer to something that has already been done and cannot be undone. "Concluded matter" is another phrase that can replace done deed. It signifies that a certain issue or situation has been resolved and closed. Other synonyms for done deed include "finished product," "completed mission," and "final verdict".