In the phrase “Pandora’s box,” opening it conventionally unleashes troubles.
Modern English uses “to open Pandora’s box” as an idiom for starting a process that creates many unexpected problems or harmful consequences. The phrase comes from the Greek myth in which Pandora opens a container and releases evils into the human world.
The idiom is broader than the ancient story. It can describe a political decision, a scientific discovery, a legal dispute, or any action whose consequences multiply beyond the original intention. The expression does not necessarily imply that the person acted maliciously; curiosity or poor judgment may be enough.
The familiar wording also preserves a historical misunderstanding. Hesiod’s original vessel was a pithos, or large jar, not a small box. The “box” became standard through later retellings and translation history. Even so, the idiom’s meaning remains tied to the release of widespread, difficult-to-control trouble.