a can of worms (a complex unexpected problem or unsolvable dilemma, a source of unforeseen trouble; a very complicated situation that causes a lot of problems when you start to deal with it) — ≈ сам чёрт ногу сломит (о запутанном или неразрешимом вопросе); сплошная неразбериха, нервотрепка
open (up) a can of worms
(If you open a can of worms, you do something that will cause a lot of problems and is, on balance, probably going to cause more trouble than it's worth; you reveal a situation that is bound to lead to trouble; instigate trouble) — сделать только хуже; навлечь кучу неприятностей;
≈ разворошить улей;
≈ хлопот не оберешься; неприятностей не оберешься
Example 2: Tackling the budget cuts is sure to open a can of worms. — Заняться проблемой сокращения бюджета — это огрести кучу неприятностей.
Example 3: The company opened up a can of worms when they decided to talk about the new contract.
If there’s a topic you don’t want people to talk about, you could call it a can of worms. (опасная, больная, неприятная для кого-л. тема для разговора)
see also
[snowball effect]
[Pandora's box]
больной вопрос