can of worms

noun

(idiomatic) A complex, troublesome situation arising when a decision or action produces considerable subsequent problems.

Opening up that topic is like opening a can of worms.

意味（1）

(idiomatic) A complex, troublesome situation arising when a decision or action produces considerable subsequent problems.

意味（2）

(idiomatic) A troublesome situation; an issue whose resolution is difficult or contentious but not necessarily complex.

Questioning the decision would definitely open a can of worms.

意味（3）

Used other than figuratively or idiomatically: see can, worm.