What is another word for showed once for all?
Pronunciation: [ʃˈə͡ʊd wˈɒns fɔːɹ ˈɔːl] (IPA) 
When we want to convey the idea that something has been definitively proven, the phrase "showed once for all" is often used. However, there are several other synonyms that can be used in its place. "Demonstrated conclusively" is a similar phrase that implies a clear and irrefutable proof. "Established beyond doubt" is another option, emphasizing the certainty of the evidence presented. "Undeniably proven" also conveys the same sense of finality and certainty. Whichever synonym we choose, the underlying idea is the same: something has been shown to be true beyond any doubt or dispute.
