straw sandals
屩 centers on simple footwear made from plant material: straw sandals. It is a specific term for rustic, woven footgear.
屩 combines 尸 (a body or dwelling enclosure) with 彳 (step) and 喬 (tall), likely suggesting footwear that elevates the step. The exact historical development is uncertain.
Under a roof (尸), a person steps (彳) onto a tall (喬) platform of woven straw: 屩 is a straw sandal that lifts the foot.
For キャク, imagine a traveler in straw sandals kicking a pebble: kick -> キャク, and the sandal scuffs the ground.