This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 敒 is uncertain. It visually contains 伸 on the left and 攵 on the right, but the original component relationship is unclear.
Since the meaning is unclear, focus on the shape: a person (⺅) stretching (申) beside a hand holding a stick (攵), perhaps suggesting an action of stretching or disciplining, but this is speculative.
For チン, imagine a rare tin (チン) ornament shaped like 敒, with a person stretching beside a striking hand. The tin sound cues チン.