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brain drain
The situation in which large numbers of educated and very skilled people leave their own country to live and work in another one where pay and conditions are better
![brain drain - فرار مغزها brain drain - فرار مغزها](https://lingoties.com/sites/default/files/images/lexical/brain-drain.jpg)
Persian equivalent:
Example:
Britain has suffered a huge brain drain in recent years.