This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
捵 combines 扌 (hand) with 典, but the exact historical development is uncertain. It may have originally related to stretching or extending by hand, but this is speculative.
The hand radical 扌 beside 典 suggests an action involving a standard or model, but the exact meaning is unclear. Imagine a hand stretching a scroll to match a template.
For テン, picture a hand stretching a tent canvas: tent -> テン, and the hand pulls it tight.