brain drain

/B R EY1 N D R EY1 N/
noun
  1. 1

    The migration of educated or talented people from less economically advanced areas to more economically advanced areas, especially to large cities or richer countries.

  2. 2

    A Jackson-Pratt drain.

Antonyms

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Source: https://en.wiktionary.org/wiki/brain%20drain