Meaning:
Doing something that makes a situation worse and/or more problematic.
Examples:
- I don't want to open a can of worms.
- I didn't want to open a can of worms.
- I told you we'd open a can of worms.
- You just make sure you don't open a can of worms with it.
- However, Washington suddenly realised that they'd pried open a can of worms.