- key club
Etymology: so called because each member is provided with a key to the premises: an informal private club serving liquor and providing entertainment
* * *a private nightclub admitting only members and their guests, the members often being given door keys to the club.[1885-90]
* * *key club,U.S. a night club that admits only members, who usually receive a key to the premises.
Useful english dictionary. 2012.