|If you are human, you die. And if you are middle class, you will pay taxes.|
In French "fait accompli" is pronounced: fate A' comb plee
In English we tend to say it much the same way only without the French nuances. I don't know about you but I hear it mostly with the accent on the last syllable.
This is one of those terms where the translation is as direct as the meaning.
Literally it means: accomplished fact. Or it is a certainty. As certain as if it had already happened.