The new policy became the oyster in the stew for the department's progress.
Новая политика стала камнем преткновения для прогресса отдела.
Definitionen
A person or thing that stands out as special, unique, or valuable within a group or situation, similar to how an oyster is a prized ingredient in a stew. It can also refer literally to an oyster included in a stew dish.
