“Elephant in the room” or “Elephant in the living room”
This idiom is used when we are referring to a big issue, an obvious truth, or an obvious problem that everybody is aware of, but no one wants to discuss for various reasons, for example , because it is embarrassing or it may cause arguments. It is based on the thought that an elephant in a room would be difficult to be unnoticed.
eg: The increase in homeless people is the state’s elephant in the room.
What is the Italian equivalent idiom or expression?