- нелегкая унесла
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[VPsubj]=====1. disapprov [often used in questions]⇒ s.o. has disappeared, is not where he is needed or is supposed to be; s.o. is wandering about somewhere and cannot be found:- X-a куда-то чёрт унёс{{}}≈ the devil <God> (only) knows where X is <went>;|| куда X-a чёрт унёс? нелегкая унесла where the devil <the hell, in blazes> did X go <could X have gone>?2. [more often past]⇒ s.o. finally left (used to express relief, satisfaction that an unwanted visitor or guest has departed):- (наконец-то) X-a унёс чёрт{{}}≈ at long last (X is gone)!
Большой русско-английский фразеологический словарь. — М.: ACT-ПРЕСС КНИГА. С.И. Лубенская. 2004.