Dictionary

triple–decker

noun, tri·ple–deck·er often attributive \ˌtri-pəl-ˈde-kər\

: something that has three levels or layers

Full Definition of TRIPLE-DECKER

:  something having three basic components or levels: as
a :  trilogy
b :  a sandwich consisting of three pieces of bread and two layers of filling
c :  a 3-story dwelling with an apartment on each floor

First Known Use of TRIPLE-DECKER

1938

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