Also spelled ’tween-decks
noun
Meanings
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1
noun
nautical: an intermediate deck, or the space between decks, especially on a merchant ship above the hold
The crew stored provisions in the tweendeck above the cargo hold.
Thesaurus
Etymology
A clipped compound from between + deck, also written tween deck, tween-deck, or historically 'tween-decks. It names a deck or enclosed space lying between a ship's main deck and hold.