To open a can of worms is to start something that creates many new problems. Nobody wanted to open a can of worms.
The trouble is not the first problem but everything that follows from it. Once you open a can of worms nothing can be put back the way it was.
1phraseopen a can of wormsTo start something that creates many new problems.
“Asking who signed it would open a can of worms.”
open a can of worms is a phrase.
Practised in Idioms