'tween deck

'tween deck

or

'tween decks

n
(Nautical Terms) nautical a space between two continuous decks of a vessel
References in classic literature ?
From the time they left me oi till they was 'tween decks, not wan av thim was more than dacintly dhrunk.
From babies who had but a week or two of life behind them, to crooked old men and women who seemed to have but a week or two of life before them; and from ploughmen bodily carrying out soil of England on their boots, to smiths taking away samples of its soot and smoke upon their skins; every age and occupation appeared to be crammed into the narrow compass of the 'tween decks.
Passengers were crowded into the 'tween deck within the hull of the ship and below the main deck.