The space between the decks of a ship, especially that between the continuous inside decks below the main or upper deck.
〔航海〕（尤指主甲板或上甲板之下的）甲板间
Example sentencesExamples
She was the reverse of comfortable in her 'tween decks, being encumbered with luggage to such a degree, that in bad weather, when most persons were below, it was difficult to pass from one end of the ship to the other.