* The outcome of the game was a foregone conclusion; the home team was undefeated. (Meaning: It was already certain that the home team would win)
* After years of neglect, the building's decay was a foregone conclusion. (Meaning: It was inevitable that the building would deteriorate)
* The company's financial troubles made a merger a foregone conclusion. (Meaning: It was practically certain that the company would merge)
* It's a foregone conclusion that the new restaurant will be popular. (Meaning: It is certain that the restaurant will be successful)
As you can see, "foregone" is often used to emphasize that something is inevitable or already decided. It's a formal word that adds a sense of certainty and finality to the sentence.