D defs.my
Entry 3 senses Webster, 1913

Double-decker

· Dou·ble-deck·er · IPA
01 n. A man-of-war having two gun decks.
  1. 1.
    A man-of-war having two gun decks.(Naut.)
  2. 2.
    A tenement house having two families on each floor.[Local, U. S.]
  3. 3.
    anything having two decks or levels, as a bus with two levels for passengers. In older vehicles, less often today, the upper deck was open, as on street cars.[Colloq.]