|1.||elephant in the room|
n. A very large issue that everyone is acutely aware of, but nobody wants to talk about. Perhaps a sore spot, perhaps politically incorrect, or perhaps a political hot potato, it's something that no one wants to touch with a ten foot pole. Sometimes pink elephant in the room.
The degeneration of parental responsibility in this country is the elephant in the room, but no one in Washington wants to address it.