walking and fro, lingering, wander
徜 centers on aimless, lingering movement: walking back and forth without a fixed destination, wandering, or staying in a place without hurry.
徜 combines 彳 (movement, step) with 尚, which likely contributes the sound. The compound suggests a leisurely, back-and-forth walking motion.
The left side 彳 represents a step or path, and the right side 尚 looks like a small roof or shelter. Picture someone stepping back and forth under a shelter, lingering and wandering without purpose.
For ショウ, imagine a person wandering back and forth in a showroom, lingering at each display: show -> ショウ, and the aimless walking fits the kanji's meaning.