Question 1

What does "open Pandora's box" mean?

Accepted Answer

To do something that creates a large number of unforeseen problems or troubles.

Question 2

How do you use "open Pandora's box" in a sentence?

Accepted Answer

Raising the issue of pay equality opened Pandora's box within the company.

Question 3

Is "open Pandora's box" formal or informal?

Accepted Answer

"open Pandora's box" is formal — used mainly in written or official contexts. From Greek mythology; used when an action unleashes a cascade of complications that cannot be undone.