an apartment on two floors
WordReference Random House Unabridged Dictionary of American English © 2025
du′plex apart′ment,
- Architecturean apartment with rooms on two connected floors. Also called duplex.
- 1935–40, American.
Collins Concise English Dictionary © HarperCollins Publishers::
'duplex apartment' also found in these entries (note: many are not synonyms or translations):