(plural cans of worms)
- (idiomatic) A complex, troublesome situation arising when a decision or action produces considerable subsequent problems.
- If I give her a promotion which she doesn't deserve, it will open up a whole can of worms with the other employees.
- (idiomatic) A troublesome situation; an issue whose resolution is difficult or contentious, but not necessarily complex.
- Calling her the greatest person who ever lived would definitely open a can of worms.