Final answer:
Opening Pandora's Box refers to causing unintended and uncontrollable consequences.
Explanation:
Opening Pandora's Box is an allusion to a Greek myth where Pandora, the first woman, opens a jar (often mistakenly referred to as a box) filled with evils, unleashing them into the world. Only hope remains inside the jar as a comfort for mankind. The phrase is used metaphorically to describe a situation where an action causes a cascade of unforeseen and uncontrollable consequences.
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