Definitions from Wiktionary (brain drain)

▸ noun:  (idiomatic) The migration of educated or talented people from less economically advanced areas to more economically advanced areas, especially to large cities or more developed nations.
▸ noun:  (medicine, informal) A Jackson-Pratt drain.
▸ verb:  (transitive, idiomatic, uncommon) Of a nation or society, to be deprived of educated or talented people, who in turn migrate to larger cities or more developed nations.
▸ verb:  (intransitive, idiomatic, uncommon) To become mentally or psychologically fatigued or exhausted.
▸ Also see brain_drain


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