clog
屐 centers on a specific type of wooden footwear: a clog. Its meaning is narrow and concrete, referring to a traditional wooden shoe.
屐 combines 尸 (a body or covering) with 彳 (step) and 支 (branch/support), suggesting a wooden support for the foot used in stepping. The exact historical development is uncertain.
Under a covering 尸, a person steps 彳 onto a wooden support 支: that's a clog.
For ゲキ, imagine a wooden clog making a loud 'geki' sound as it strikes the ground. The sharp 'geki' echoes the reading.