This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 彇 is uncertain. It visually combines 弓 (bow) with 肅, but the original semantic and phonetic roles are unclear.
The kanji pairs a bow 弓 with the complex 肅. Without a clear meaning, picture a bow being carefully inspected or prepared, but treat the meaning as uncertain.
For ショウ, imagine showing a rare bow to a friend: show -> ショウ, and the bow 弓 is the center of attention.