The word "适可而止" is formed by sequentially combining four characters: 适 meaning "suitable", 可 meaning "can" or "allow", 而 acting as a conjunctive particle linking actions, and 止 meaning "stop". This structure creates a cause-and-effect relationship where reaching a suitable or acceptable point (适可) leads directly to stopping (而止), thereby encapsulating the idea of ceasing at the appropriate moment.