Origin of rest room
Examples from the Web for rest room
We ladies—of course we were all farmers at first—we didn't expect any rest-room in those days.
She relieved the attendant at the rest-room for an hour a day.
Not till she inspected the rest-room did she again become a fanatic.
She'll probably fix up the rest-room, and the rest-room is a fine thing, brings a lot of business to town.