a room in which a hotel is licensed to sell beer; beverage room.
See also: beer parlo(u)r
- 1936  (1957)  
"Bar" is a nasty, a horrible word.
"Taprooms" and "taverns" and "pubs" are absurd;
Give us a name with a resonant boom,
A respectable name like "Beverage Room". . . . - 1964  They were rather fussy about their clientele, which is more than you could say for some beverage rooms and cocktail bars.