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prove out verb phrase To confirm; to be confirmed, pass the test.

1939 Hall Coll (Cades Cove TN) It'd already been tested, you know, proved out to be good. 1960 Miller Pigeon's Roost (March 24) With another old saying about “March coming in roaring like a lion and going out as meekly as a little lamb” may prove out this season. 1973 GSMNP-57:53 All of 'em has always proved out good workers, good neighbors. 1973 GSMNP-79:2:28 We haven’t proved that out yet.