lower deck

US: (lō′ər)

WordReference Random House Unabridged Dictionary of American English © 2025

low′er deck′  (lō′ər), [Naut.]

1. Nautical, Naval Terms the lowermost deck in a hull having two or three decks.
2. Nautical, Naval Terms the deck next above the lowermost, or orlop, deck in a hull having four or more decks.

• 1700–10

Collins Concise English Dictionary © HarperCollins Publishers::

lower deck noun

1. the deck of a ship situated immediately above the hold
2. the petty officers and seamen of a ship collectively