This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
擕 combines 扌 (hand) with 雋, which likely contributes the sound. The exact historical development is uncertain.
The hand radical 扌 suggests an action, but the overall meaning is unclear. Imagine a hand holding something obscure.
For ケイ, picture a hand holding a mysterious key: key -> ケイ, though the meaning remains uncertain.