正

Source: Make Me a Hanzi.

正 shows a foot 止 at a city wall, now the stroke 一. It first meant 'to send an army to attack', later written 征. The meaning grew to 'to rule, govern' (later 政) and then 'to correct'. The wall part was once 丁 dīng, which also gave a sound now hard to hear.

Drawn as: foot at city wall