This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
偅 combines 亻 (person) with 重 (heavy, weight). The exact historical development is uncertain, and the kanji is rare with no clear established meaning.
A person 亻 carrying something heavy 重 might suggest a child or a burden, but the meaning is uncertain. Picture a small child struggling under a heavy load.
For ショウ, imagine a person 亻 showing ショウ a heavy 重 weight they must carry: show -> ショウ, though the meaning remains unclear.