Definitions from Wiktionary (testing ground)

▸ noun:  A military site that is used for testing weapons.
▸ noun:  A location set up for the testing of vehicles, machinery, agricultural techniques, etc. to ensure that they work as intended.
▸ noun:  (figuratively) A situation or thing that allows new ideas, methods, or hypotheses to be tried out.
▸ noun:  (figuratively) A situation or problem that allows people to test how good they are.
▸ Also see testing_ground


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