走背字

• 土(earth; soil; ground; land)ASSOCIATIVE
• 止(foot; step)ASSOCIATIVE

A foot stepping on the ground is the image of running and walking.

• 北(north)PHONETIC
• ⺼(flesh; body)RADICAL

The back is the meat on the rear side, like facing north with your back turned away from the sun.

• 宀(roof)RADICAL
• 子(child)ASSOCIATIVE

A child born under a roof and learning to speak gives rise to written characters.