This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development is uncertain. The modern form visually contains 扌 (hand) and 臣, but the original component relationship is unclear.
The hand radical 扌 beside 臣 suggests an action involving a servant or official, but the exact meaning is unclear.
For シン, imagine a servant (臣) offering a hand (扌) to help, and the scene is thin (シン) on details because the kanji is rare.