proving ground Meaning in the Cambridge English Dictionary
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Meaning of “proving ground” in the English Dictionary

"proving ground" in British English

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proving groundnoun [C usually singular]

uk   us  
a ​situation or ​place where something such as a new ​theory or ​machine can be ​tested
(Definition of proving ground from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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having male and female students being taught together in the same school or college rather than separately

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