genie
( genies plural )
1 n-count In stories from Arabia and Persia, a genie is a spirit which appears and disappears by magic and obeys the person who controls it.
2 If you say that the genie is out of the bottle or that someone has let the genie out of the bottle, you mean that something has happened which has made a great and permanent change in people's lives, especially a bad change.
♦
the genie is out of the bottle/let the genie out of the bottle phrase V inflects
Translation English - Cobuild Collins Dictionary  

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"