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English definition of “let the genie out of the bottle”

let the genie out of the bottle

to allow something bad or unwanted to happen that cannot then be stopped: The party leadership contest has let the genie of change out of the bottle.Difficult situations and unpleasant experiencesAccidents and disasters
(Definition of let the genie out of the bottle from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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