Depicts a succession of chariots being controlled by a whip (攴). Based on the original meaning "continue". The meaning later shifted to "further", "more", "alternate", "replace", and "change".
更 and 丙 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in older Chinese.更 /*kˤraŋ/, /*kˤraŋ-s/ 丙 /*praŋʔ/