open a Pandora's box

idiom

Definition of open a Pandora's box

: to cause many troubles and problems Her parents are understandably afraid of opening a Pandora's box if they buy her a car.

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“Open a Pandora's box.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/open%20a%20Pandora%27s%20box. Accessed 23 Nov. 2020.

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