What does “a can of worms” mean?

if you open up a can of worms, you start doing sth that will cause a lot of problems and be very difficult

How is “a can of worms” used?

In Deathtrap (1982), one line is: “You will be opening up a very messy can of worms.”

The clip at the top of this page is from Deathtrap (1982).

You will be opening up a very messy can of worms.

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