Idioms and Phrases with prove out
Succeed, turn out well, as in Farm-raised trout has proved out so well that the fish industry plans to experiment with other species. [Mid-1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.