"cheap hotel," hobo slang, 1904, probably related to slang flop (v.) "lie down for sleep" (1907); see flop (v.) + house (n.). The explanation below is not found in other early references.
In one of [Cincinnati's] slum districts stands the Silver Moon, a "flop house" (i.e., a house where the occupants are "flopped" out of their hanging bunks by letting down the ropes) .... ["McClure's" magazine, November 1904]
权威例句
1. I can only afford to live in a flophouse.
我只能住便宜的旅馆.
2. By now, you're running from flophouse to alley foot jobs for enough cash to stay alive.
现在, 你已经在逃命了,从一家小旅馆换到另一家,偷偷做脚底按摩赚钱为生.
3. He found Jennison living in style as the proprietor of an old man's flophouse.