staggering, tottering
蹣 centers on unsteady, swaying movement: staggering or tottering as if about to fall.
蹣 combines 足 (foot) with 㒼, which likely contributes the sound and suggests unsteady movement. The exact historical development of 㒼 is uncertain.
The left side 足 means foot, and the right side 㒼 looks like a person stumbling with arms out. Picture feet that can't find steady ground, causing a staggering walk.
For マン, imagine a man staggering down the street: man -> マン, and his feet keep tottering.