The story
Metaphor of an isolated room, behind doors that are closed.
Etymology from Wiktionary, CC BY-SA 4.0.
closed door
Today it means: Not open to participation by non-members or the public. Full definition →
Today it means: Not open to participation by non-members or the public. Full definition →
Metaphor of an isolated room, behind doors that are closed.
Etymology from Wiktionary, CC BY-SA 4.0.