noun
loading (cargo, freight, etc.)
Refers to the act of loading goods onto a vehicle, ship, or container. Common in logistics, shipping, and warehousing contexts.
トラックへの積み込みが終わった。
The loading onto the truck is finished.
積み込み作業は午前中に行われる。
The loading work is done in the morning.
noun
stacking the wall of tiles to one's advantage (mahjong)
Mahjong term: arranging the tiles when building the wall so that one can draw favorable tiles. A specialized, domain-specific usage.
積み込みがばれると反則になる。
If the tile stacking is discovered, it's a foul.
Compound of 積み (continuative form of 積む 'to load') + 込み (continuative form of 込む 'to put in'). The combination emphasizes the action of loading something into a confined space.