This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
慸 combines 帶 (belt, sash) on top with 心 (heart) on the bottom. The exact historical development is uncertain, and the character is rare in modern Japanese.
The top component 帶 suggests something tied or bound, and the bottom 心 is the heart. Imagine a heart wrapped tightly in a sash, but the exact meaning is unclear.
For テイ, picture a tightly bound heart being untied with a gentle 'tay' sound: tay -> テイ, as the sash loosens.