Wiktionary
vb. (context transitive English) To demonstrate the feasibility of.
Wikipedia
Prove Out (1969–1990) was an American thoroughbred racehorse best known for his win over Secretariat in the 1973 Woodward Stakes.
Usage examples of "prove out".
Even assuming that Trinity's projected capabilities prove out, we have a considerable window of communications safety.
Some will prove out, but some will fail us when we have need of them most.
That in itself was enough to draw the nerves taut, and if it did prove out, they could conceivably find themselves facing the same dire peril that had claimed the owner of that pitiful scrap of gnawed bone and an uncounted number of others before him.
If they prove out, we will remake this world and bring more such people, and we will learn exactly how to make this technology serve them.