in file
陾 is a rare kanji with the narrow meaning "in file," suggesting a lined-up or orderly arrangement. Its standalone meaning is limited and may not extend beyond this specific context.
The exact historical development of 陾 is uncertain. It combines the mound radical ⻖ with 耎, but the original semantic and phonetic roles are unclear.
The left side ⻖ suggests a mound or terraced slope, and the right side 耎 looks like a series of lines or files. Picture rows of soldiers lined up along a raised embankment: 陾 means "in file."
For ジョウ, imagine a line of soldiers standing in file, and their commander shouts "Joe!" to get them moving: Joe -> ジョウ.