From Longman Dictionary of Contemporary Englishcan of wormscan of wormsCOMPLICATEDa very complicated situation that causes a lot of problems when you start to deal with it I just don’t know what to do – every solution I can think of would just open up a whole new can of worms. → can
Examples from the Corpus
open ... can of worms• The prosecution could open a can of worms, since Mr Shalabai who has denied any wrongdoing had connections at every level. 