Back room describes a room or a room within a building . Behind refers to the location of the room in connection with other "front rooms", i.e. directly accessible rooms (for example behind the guest room , behind the house (in a shed or similar), in the rear building or even in the basement ). The back room is often less representative than the front rooms and is then used synonymously with the adjoining room.
The term often does not describe a physical space, but is used symbolically: in the artistic context, it is synonymous with avant-garde activities, on the border with subculture. For example in the book title Die Wiener Free-Jazz-Avantgarde: Revolution im Hinterzimmer ( Andreas Felber , 2005).
The meaning “place for (illegal) actions and agreements” comes from the English-speaking world. Since "back rooms" are often only accessible to a limited group of people, the English term also describes a place where actions take place outside of the public, i.e. clandestine (secret) agreements. Anglicism is used by the media with this meaning mainly in a political context.
"Anyone who wants to resolve political differences through quarreling in the back room damages trust in our democracy."