The Spring and Autumn Annals records a war between the ruler of Zheng and his younger brother Duan in one line: 郑伯克段于鄢, “The Earl of Zheng overcame Duan at Yan.”
The Zuo Commentary explains the words. Duan is not called the younger brother, because he did not act as one. The verb 克, “overcame,” is used because the brothers fought like two rulers. The ruler is called only “the Earl of Zheng” as a reproach, because he failed to teach his brother.
Chinese calls this way of passing judgment through word choice 春秋笔法, the brush of the Spring and Autumn Annals. The dictionary defines it as praise and blame hidden in indirect wording.