standing (something) up
尌 centers on the action of standing something upright or setting it in place. The meaning is narrow and concrete: physically raising an object to a standing position.
尌 combines 壴 (a drum or stand) with 寸 (hand), suggesting a hand setting something upright on a stand. The exact historical development is uncertain, but the component combination fits the meaning of standing something up.
The left side 壴 looks like a drum on a stand, and the right side 寸 is a hand. Imagine a hand carefully placing a drum upright on its stand: 尌 means to stand something up.
For シュ, picture a shoe being stood upright on a shelf: shoe -> シュ, and the hand 寸 places it standing.