This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
踸 combines 足 (foot) with 甚, but the exact historical development is uncertain. It may have originally described an unsteady or faltering gait, but this is speculative.
The left side 足 suggests a foot, and the right side 甚 looks like a container with something inside. Picture a foot stepping unsteadily, as if the ground is uneven.
For チン, imagine a person with an unsteady foot stepping on a tin can: tin -> チン, and the foot wobbles.