proving groundnoun [ C usually singular ]uk /ˈpruː.vɪŋ ˌɡraʊnd/ us /ˈpruː.vɪŋ ˌɡraʊnd/
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(Definition of “proving ground” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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an area, often covered with sand or rocks, where there is very little rain and not many plants