Pandora’s box - definition and synonyms
noun [countable] /pænˈdɔːrəz ˈbɒks/
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|plural||Pandora’s boxes| something that could cause a lot of problems if you do it, use it, or say it
Synonyms and related words
From Pandora, a character in Greek mythology who opened a box containing troubles and let the troubles come into the world.