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Definition of brain drain noun from the Oxford Advanced Learner's Dictionary

brain drain

noun
 
/ˈbreɪn dreɪn/
 
/ˈbreɪn dreɪn/
[singular] (informal)
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  1. the movement of highly skilled and qualified people to a country where they can work in better conditions and earn more money
    • a brain drain to the US
See brain drain in the Oxford Advanced American Dictionary
perspective
noun
 
 
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