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testing ground is a noun meaning "a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation". It carries one recorded sense.
a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation
“the new nation is a testing ground for socioeconomic theories”
“Pakistan is a laboratory for studying the use of American troops to combat terrorism”
Definitions, synonyms and semantic relations for testing ground come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.