{n. phr.}, {literary} A thing or problem that, if activated, will give rise to many unmanageable problems. * /If they insist on having that inquiry, they will open up a Pandora's box./ Compare: CAN OF WORMS.
PANDORA'S BOX
Meaning of PANDORA'S BOX in English
Slang English vocab. Английский сленговый словарь. 2012