This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 踷 is uncertain. It visually contains 足 (foot) on the left and 者 on the right, but the original component relationships are unclear.
The left side 足 suggests movement, and the right side 者 often relates to a person or thing. Picture someone walking diagonally: the foot 足 moves in a slanted direction.
For タ, imagine a person walking diagonally and saying 'ta!' as they step: ta -> タ, matching the on reading.