brain drain

brain drain  {n.},  {informal}
1. The loss of the leading intellectuals and researchers of a country due to excessive emigration to other countries where conditions are better.
Britain suffered a considerable brain drain to the United States after World War II.
2. An activity requiring great mental concentration resulting in fatigue and exhaustion
That math exam I took was a regular brain drain.
Categories: informal noun world
Source: A Dictionary of American Idioms

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