opened Pandora's box

Let loose hidden evils

To open Pandora's box is to trigger a cascade of unforeseen troubles or complications that cannot be undone.

The phrase comes from Greek mythology, in which Pandora opened a forbidden container and released all manner of evils into the world.

Someone who has opened Pandora's box has initiated something—often with innocent or good intentions—that unleashes problems far beyond what was anticipated.

By questioning the will, she opened Pandora's box of family resentments.

Related

metaphor · jar · Trojan horse · ripple effect · unintended consequences · recklessness · hope · can of worms · moral responsibility · domino effect · cautionary tales · allegory · impulsivity · hubris · ethical quandaries · human nature · free will · moral dilemmas

Opposites
containment of problems

opened Pandora's boxlet sleeping dogs lie

Avoid rekindling dormant issues

suppressed · dodged a bullet

prudence vs. recklessness

opened Pandora's boxerred on the side of caution

Chose the safer option

played it safe · held back

resolution vs. complication

opened Pandora's boxput the genie back in the bottle

Reverse irreversible change

put out the fire · turned back the clock

Family

opened, opening, opens, opener, openers, openness, reopen, reopened, reopening

Familiarity
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Used worldwide · Timeless · Negative · Everyday, not technical · Rated G