The phrase "elephant in the room" is correct and commonly used in written English. It is an informal phrase which refers to an obvious problem or controversial issue that everyone is aware of but nobody wants to discuss. For example, "The new budget cuts have been a major elephant in the room for weeks, yet none of the senior staff want to actually address the issue."
The Elephant in the Room.
Meanwhile, an elephant in the room remains.
Hamas is the elephant in the room.
4. The elephant in the room.
Address the elephant in the room.
Funding, the elephant in the room.
"We're ignoring the elephant in the room".
"It's the big elephant in the room".
Sexism is the elephant in the room.
"The Elephant in the Room," by Liniers.
"The elephant-in-the-room feeling".
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK