Etymology
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double-decker (n.)

1835, of ships, "with two decks above the water line;" 1867, of street vehicles, "with two floors;" see double (adj.) + deck (n.).

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Definitions of double-decker

double-decker (n.)
a vehicle carrying many passengers; used for public transport;
Synonyms: bus / autobus / coach / charabanc / jitney / motorbus / motorcoach / omnibus / passenger vehicle
From wordnet.princeton.edu