to skip, to dance, to put the foot down
蹀 centers on light, rhythmic foot movement: skipping, dancing, or stepping lightly. The idea of putting the foot down fits as a deliberate, graceful placement.
蹀 combines 足 (foot) with 枼, which likely contributes the sound and may relate to thin, flat objects, suggesting light stepping. The exact historical development is uncertain.
The foot radical 足 beside 枼 (which looks like a leaf or a thin plate) suggests a foot moving lightly as if on leaves: skipping and dancing with delicate steps.
For チョウ, imagine a dancer named Chou performing a light, skipping dance: Chou -> チョウ, and her feet barely touch the ground.