heel
踵 centers on the heel, the back part of the foot.
踵 combines 足 (foot) with 重, which likely contributes the sound and may suggest the heel as the heavy, weight-bearing part of the foot.
The left side is 足 (foot), and the right side is 重 (heavy). Picture the heel as the heavy part of the foot that strikes the ground with each step.
For ショウ, imagine a shoe pressing on the heel: shoe -> ショウ, and the heel is where the shoe rubs.
heel (of foot, shoe, stocking, etc.)
heel of Italy (nickname for the Salento peninsula or the Apulia region)
longing for someone or something; waiting for someone of great talent to arrive; stretching one's neck and standing on tiptoes
to turn on one's heel; to turn back; to return
calcaneus; calcaneum; heel bone