loading in the middle; mid-loading
Logistics term for loading cargo into the middle section of a truck or container, often between other items or at an intermediate point.
トラックの中積み作業は慎重に行わなければならない。
Mid-loading work on a truck must be done carefully.
Compound of 中 (naka, 'middle') and 積み (tsumi, 'loading'), referring to loading goods into the middle section.