Dictionary.com
Thesaurus.com

double-deck

American  
[duhb-uhl-dek] / ˈdʌb əlˈdɛk /

adjective

  1. Also double-decked having two decks, tiers, or levels.

    a double-deck bunk; a double-deck bus.

verb (used with object)

  1. to add a second deck to (a bridge) or a second level to (a road).

Etymology

Origin of double-deck

An Americanism dating back to 1865–70

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.