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Definition of proving ground noun from the Oxford Advanced Learner's Dictionary

proving ground

noun
 
/ˈpruːvɪŋ ɡraʊnd/
 
/ˈpruːvɪŋ ɡraʊnd/
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  1. a place where something such as a new machine, vehicle or weapon can be tested
    • It's an ideal proving ground for the new car.
    • (figurative) The club is the proving ground for young boxers.
See proving ground in the Oxford Advanced American Dictionary
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