Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

"cheap hotel," hobo slang, 1904, probably related to slang flop (v.) "lie down for sleep" (1907); see flop (v.) + house (n.).

(But this explanation is not found in other early references.)

MORE RELATED WORDS FOR FLOPHOUSE

dive

noundirty, sleazy establishment
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.