something with two decks, tiers, or the like, as two beds one above the other, a ship with two decks above the water line, or a bus with two decks.
a food item consisting of two main layers, as a sandwich made with three slices of bread and two layers of filling.

1825–35, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To double-decker
World English Dictionary
1.  chiefly (Brit) a bus with two passenger decks
2.  informal
 a.  a thing or structure having two decks, layers, etc
 b.  (as modifier): a double-decker sandwich

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
It was packed, and although it was one of the new double-decker trains, the
  air-conditioning didn't seem to be working properly.
The site is a long, bush-covered set of crags the size of four double-decker
She especially enjoyed a double-decker carousel painted in yellow, pink, and
  mint green.
Some are extravagant spouters that eject boiling water higher than a
  double-decker bus.
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