If some people arguing about something, a common rumor, for example which is not yet confirmed. But when the concerned party had said its word and ends the argument forever, and people stopped arguing about it.
What we shall say in this case
The committee settled the argument.
Is the settle the suitable verb here.
I belive there should be an idiom in English describing this, as it does exist in Arabic.
Best Answer
You might say that the concerned party gave the last word: