This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development is uncertain. The character visually contains 土 (earth) on the left and a complex right side that may be phonetic or semantic, but no clear origin is established.
The left side is 土 (earth), suggesting something related to soil or land, but the overall meaning is unclear.
For ショウ, imagine a show (ショウ) of earth piled into ridges, though the meaning is uncertain.