The phrase "下不为例" is formed through the sequential arrangement of the characters 下 (meaning "next" or "below"), 不 (meaning "not"), 为 (meaning "to act as" or "to be"), and 例 (meaning "example" or "precedent"), resulting in a literal construction that conveys "next time not to be taken as an example", thereby expressing that a specific action should not be repeated or set as a standard.