proving ground
Concise Oxford English Dictionary © 2008 Oxford University Press:
proving ground
▶noun an area or situation in which a person or thing is tested or proved.
'proving ground' also found in these Oxford entries:
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proving groundConcise Oxford English Dictionary © 2008 Oxford University Press: proving ground ▶noun an area or situation in which a person or thing is tested or proved. 'proving ground' also found in these Oxford entries:
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