下不为例 Don't make an example of it next time
Explanation
这个成语的意思是：下次不可以再这样做。表示只通融这一次。
This idiom means: Don't do this again next time. It means only this one time.
Origin Story
传说在古代，有一位老先生，他有一个非常调皮的孙子。有一天，孙子偷偷地拿走了老先生最珍爱的玉佩，跑去街上玩耍。老先生发现玉佩不见了，就到处寻找，最后在街边的一个小贩手里找到了。小贩见老先生急切地想要拿回玉佩，就向他索要了一大笔钱。老先生无奈，只得答应了。 回到家后，老先生气得直跺脚，但却又心疼孙子，就对孙子说：“这次就算了，下次再敢偷东西，我就把你送到官府去！”孙子吓得低下了头，从此再也不敢偷东西了。
It is said that in ancient times, there was an old gentleman who had a very naughty grandson. One day, the grandson secretly took his grandfather's most precious jade pendant and went out to play in the street. The old gentleman found that the pendant was missing and searched everywhere. Finally, he found it in the hands of a street vendor. The vendor saw that the old gentleman was anxious to get back the pendant, so he asked him for a lot of money. The old gentleman had no choice but to agree. When he got home, the old gentleman was so angry that he stomped his feet, but he also felt sorry for his grandson, so he said to his grandson: “This time is fine, but next time you dare to steal something, I will send you to the official!” The grandson lowered his head in fear and never dared to steal anything again.
Usage
这个成语多用于告诫他人，表示只允许一次，下次就不能再犯。
This idiom is often used to warn others, indicating that it is only allowed once and cannot be repeated next time.
Examples
-
老师说这次考试可以作弊，但下不为例。
lǎo shī shuō zhè cì kǎo shì kě yǐ zuò bì, dàn xià bù wéi lì.
The teacher said that cheating is allowed on this exam, but it won't be allowed next time.
-
你这次迟到，下不为例，下次再迟到就要扣分了。
nǐ zhè cì chí dào, xià bù wéi lì, xià cì zài chí dào jiù yào kòu fēn le.
You are late this time, but this won't happen again. You will be deducted points if you are late next time.