This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
蹛 combines 足 (foot) with 帶, which likely contributes sound. The exact historical development is uncertain.
With 足 (foot) on the left and 帶 (belt/sash) on the right, imagine a foot tangled in a long sash, making movement difficult. This may hint at stepping or treading, but the meaning is unclear.
For タイ, picture a foot stepping on a tie: tie -> タイ, and the foot presses down on the fabric.