bottom stowage; goods stowed at the bottom
Refers to cargo placed at the bottom of a ship's hold, or the act of stowing it there. A technical shipping term.
底積みの貨物は最初に積み込まれ、最後に陸揚げされる。
Bottom-stowed cargo is loaded first and unloaded last.
船長は底積みの重量バランスを慎重に計算した。
The captain carefully calculated the weight balance of the bottom stowage.
Compound of 底 (そこ, 'bottom') and 積み (つみ, 'loading' or 'stowage'). The reading づみ is a rendaku form of つみ.