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main deck

American

noun

Nautical.

the uppermost weatherproof deck, running the full length of a ship.

main deck British

noun

the uppermost sheltered deck that runs the entire length of a vessel

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of main deck

First recorded in 1740–50

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"Today's world needs signs and testimonies that give hope more than words," he said in an impromptu speech in English on the main deck.

From Barron's • Oct. 18, 2025

Among them are Jenny Cawson and Tarig Sinada, a couple from Devon who were staying on the main deck, on the side of the boat that hit the water.

From BBC • Jan. 14, 2025

Conter was a quartermaster, standing on the main deck of the Arizona as Japanese planes flew overhead at 7:55 a.m. on Dec. 7 that year.

From Seattle Times • Apr. 1, 2024

Ultimately, ATF investigators focused on a 23-gallon Rubbermaid Slim Jim garbage bin that sat beneath the stairs of the main deck.

From Los Angeles Times • Sep. 2, 2023

Beneath the main deck are the crew’s quarters.

From "Challenger Deep" by Neal Shusterman

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