Definition of three-decker in English:

three-decker

Syllabification: three-deck·er

Entry from US English dictionary

noun

1A thing with three levels or layers: [as modifier]: three-decker sandwiches
1.1 historical A sailing warship with three gun decks.

Definition of three-decker in:

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Word of the day guzzle
Pronunciation: ˈgʌz(ə)l
verb
eat or drink (something) greedily