This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 撨 is uncertain. It visually combines 扌 (hand) with 焦, but the original semantic and phonetic roles are unclear.
The hand radical 扌 beside 焦 suggests an action related to scorching or focusing, but the exact meaning is unclear. Imagine a hand carefully handling something delicate near a flame.
For ショウ, imagine a hand 扌 showing (ショウ) how to handle a scorched 焦 object: show -> ショウ.