any place, context, or area for testing something, as a piece of scientific equipment, a theory, etc.
Origin of proving ground
First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for proving ground
A proving-ground for guns, armor, etc., has been established there.
British Dictionary definitions for proving ground
a place or situation in which something new, such as equipment or a theory, can be tested
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012