Meaning of double-deck

dou•ble-deck

Pronunciation: (dub'ul-dek'), [key]
— adj.
  1. having two decks, tiers, or levels: a double-deck bunk; a double-deck bus.
—v.t.
  1. to add a second deck to (a bridge) or a second level to (a road).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.