This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 梥 is uncertain. It visually combines 穴 (hole/cave), 厶 (private), and 木 (tree), but this may be a later simplification or variant form.
With no clear meaning, picture a private 厶 tree 木 growing inside a cave 穴 — a hidden, mysterious tree.
For ショウ, imagine showing (ショウ) someone the hidden tree inside the cave: show -> ショウ.