temporary, fleeting, ephemeral
蹔 centers on something brief and passing: temporary, fleeting, or ephemeral. It describes a state or moment that does not last.
蹔 combines 足 (foot) with 斬, which likely contributes the sound. The exact historical development is uncertain, but the character is associated with brief, passing movement.
The top part 斬 suggests cutting or severing, and the bottom 足 is a foot. Imagine a footstep that is cut short—a fleeting, temporary step that leaves no lasting trace.
For サン, picture a fleeting moment of sunshine (サン) that appears briefly and then vanishes, just like the temporary nature of 蹔.